NEW COMBINATIONS AND NEW NAMES IN AMERICAN CINNAGROSTIS, PEYRITSCHIA, AND DESCHAMPSIA, AND THREE NEW GENERA: GREENEOCHLOA, LAEGAARDIA AND PARAMOCHLOA (POEAE, POACEAE)

Abstract

Based on morphological and molecular evidence we present new combinations or new names for 77 taxa of Cinnagrostis, seven taxa of Deschampsia, and 24 taxa of Peyritschia; and describe three new genera, Greeneochloa P.M. Peterson, Soreng, Romasch. & Barberá, gen. nov. (subtribe Echinopogoninae), Paramochloa P.M. Peterson, Soreng, Romasch. & Barberá, gen. nov. (subtribe Calothecinae), and Laegaardia P.M. Peterson, Soreng, Romasch. & Barberá, gen. nov. (subtribe Calothecinae) with two, two and one species, respectively. In addition to the 116 new taxonomic entities, we provide a key to the genera of American grasses presently or formerly treated in Calamagrostis or Deyeuxia and generic emendations for Cinnagrostis and Peyritschia.

Full text

Peterson, P.M., R.J. Soreng, K. Romaschenko, P. Barberá, A. Quintanar, and C. Aedo. 2019. New combinations and new
names in American
Cinnagrostis, Peyritschia
, and
Deschampsia
, and three new genera:
Greeneochloa, Laegaardia
, and
Paramochloa
(Poeae, Poaceae). Phytoneuron 2019-39: 1–23. Published 16 October 2019. ISSN 2153 733X
NEW COMBINATIONS AND NEW NAMES IN AMERICAN
CINNAGROSTIS, PEYRITSCHIA, AND DESCHAMPSIA,
AND THREE NEW GENERA:
GREENEOCHLOA, LAEGAARDIA AND PARAMOCHLOA (POEAE, POACEAE)
PAUL M. PETERSON, ROBERT J. SORENG, AND KONSTANTIN ROMASCHENKO
Department of Botany
National Museum of Natural History
Smithsonian Institution
Washington, D.C. 20013-7012
peterson@si.edu; sorengr@si.edu; romashchenkok@si.edu
PATRICIA BARBERÁ
Department of Africa and Madagascar
Missouri Botanical Garden
St. Louis, Missouri 63110-2291
pbarbera@mobot.org
ALEJANDRO QUINTANAR AND CARLOS AEDO
Department of Biodiversity and Conservation
Real Jardín Botánico
Consejo Superior de Investigaciones Científicas
28014 Madrid, Spain
quintanar@rjb.csic.es; aedo@rjb.csic.es
ABSTRACT
Based on morphological and molecular evidence we present new combinations or new names for
77 taxa of Cinnagrostis, seven taxa of Deschampsia, and 24 taxa of Peyritschia; and describe three new
genera, Greeneochloa P.M. Peterson, Soreng, Romasch. & Barberá, gen. nov. (subtribe Echinopogoninae),
Paramochloa P.M. Peterson, Soreng, Romasch. & Barberá, gen. nov. (subtribe Calothecinae), and
Laegaardia P.M. Peterson, Soreng, Romasch. & Barberá, gen. nov. (subtribe Calothecinae) with two, two
and one species, respectively. In addition to the 116 new taxonomic entities, we provide a key to the genera
of American grasses presently or formerly treated in Calamagrostis or Deyeuxia and generic emendations
for Cinnagrostis and Peyritschia.
RESUMEN
De acuerdo con evidencias de carácter morfológico y molecular se presentan nuevas combinaciones
o nuevos nombres para 77 táxones de Cinnagrostis, siete táxones de Deschampsia y 24 táxones de
Peyritschia, así como la descripción de tres nuevos géneros, Greeneochloa P.M. Peterson, Soreng,
Romasch. & Barberá, gen. nov. (subtribu Echinopogoninae), Paramochloa P.M. Peterson, Soreng,
Romasch. & Barberá, gen. nov. (subtribu Calothecinae) y Laegaardia P.M. Peterson, Soreng, Romasch. &
Barberá, gen. nov. (subtribu Calothecinae) con dos, dos y una especie respectivamente. Además de las 116
nuevas entidades taxonómicas, proporcionamos una clave para los géneros de gramíneas americanas tratadas
actual o anteriormente en Calamagrostis o Deyeuxia y enmendamos los genéros Cinnagrostis y Peyritschia.
In a large unpublished molecular DNA sequence study using four gene regions (ITS, rpl32-
trnL spacer, rps16-trnK spacer, and rps16 intron) we found most South American species of Deyeuxia
Clarion ex P. Beauv. and Calamagrostis Adans., to align in a large clade excluding the type species of
each of these genera (Peterson et al., in prep.). These results were largely corroborated by Saarela et
al, (2010, 2017) in the study of Poeae R. Br. chloroplast group I where genera were split into
Koeleriinae Asch. & Graebn. clade A (e.g. Koeleria Pers. and others) and Koeleriinae clade B
(Cinnagrostis Griseb., Peyritschia E. Fourn., and others). We, therefore are resurrecting Cinnagrostis
(Grisebach, 1874), a little known genus described from a single dichogamous species, C. polygama

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Peterson et al.: New grass combinations and names
Griseb., for the taxa in this South American clade. Sister to Cinnagrostis are Mexican and Central
American species of Trisetum Pers., Calamagrostis, and Peyritschia that form the Peyritschia clade
(Romaschenko et al. in prep.). Recent molecular phylogenetic studies confirmed that Trisetum s.l. is
polyphyletic and now contains only two or three species (Soreng & Davis 2000; Quintanar et al. 2007;
Saarela et al. 2017; Barberá et al. 2019). Finot et al. (2006) treated Peyritschia s.s. as having seven
species but we are expanding it here to include 32 species. In our same unpublished molecular DNA
study we found two species (Greeneochloa P.M. Peterson, Soreng, Romasch. & Barberá, gen. nov.) of
Calamagrostis from North America in a clade within the Echinopogoninae Soreng, and three species
of Calamagrostis/Deyeuxia from South America in a clade within the Calothecinae Soreng that we treat
here in Laegaardia P.M. Peterson, Soreng, Romasch. & Barberá, gen. nov. and Paramochloa P.M.
Peterson, Soreng, Romasch. & Barberá, gen. nov. We also have molecular support to place four species
and two varieties in Deschampsia P. Beauv. following the criteria used by Saarela et al. (2017).
The United States National Herbarium (US) in the Department of Botany, National Museum
of Natural History, Smithsonian Institution, is in the process of rearranging the grass collection in a
phylogenetic sequence following Soreng et al. (2017). To accommodate each grass genus in the family
we have generated 781 G-numbers in our location poster called Systema Graminum
(DOI:10.13140/RG.2.2.26027.34084). For using the US collection (or anyone else using our linear
phylogenetic sequence) one must first look up the genus number and then proceed to the appropriate
cabinet housing the specimens. G-numbers for the genera treated in this paper are: Cinnagrostis (210),
Deschampsia (261), Greeneochloa (231B), Laegaardia (234E), Paramochloa (234C), and Peyritschia
(216).
Based on our unpublished molecular DNA sequence phylogeny, and review of morphological
characters on specimens and documented in primary protologues and secondary, we present new
combinations or new names for 77 taxa of Cinnagrostis, seven taxa of Deschampsia, and 24 taxa of
Peyritschia; and describe three new genera, Greeneochloa, Paramochloa, and Laegaardia with two,
two and one species, respectively. In addition to the 116 new taxonomic entities, we provide a key to
the genera of American grasses presently or formerly treated in Calamagrostis or Deyeuxia, and generic
emendations for Cinnagrostis and Peyritschia. An asterisk (*) following the combination or name
indicates we lack molecular evidence but based on morphology we feel confident in its placement.
TAXONOMY
CINNAGROSTIS Griseb., Abh. Königl. Ges. Wiss. Göttingen 19: 256–257, t. 2, f. 7. 1874, gen. emend.
TYPE: Cinnagrostis polygama Griseb. [≡ Calamagrostis polygama (Griseb.) Parodi ≡
Deyeuxia polygama (Griseb.) Parodi].
Description―Cespitose or rhizomatous perennials, a few stoloniferous. Culms 1−180 cm tall,
generally erect, simple or branched; nodes glabrous or hairy. Leaf sheaths longer or shorter than the
internodes, open, smooth or scabrous, glabrous or hairy; ligules usually ≤ 4.5 mm long [infrequently
the longest 5 to 10(−15 mm)], membranous, apex truncate, rarely acuminate, usually scabrous or
variously pubescent; leaf blades linear, straight or recurved, flat, convolute or conduplicate. Panicles
terminal, lax or contracted, spiciform or subspiciform to globose, greenish, straw-colored, silver or
gold. Spikelets 1−12 mm long, 1-flowered, laterally compressed, lanceolate to occasionally ovate;
rachilla prologation usually hairy; disarticulation above the glumes; glumes 2, lanceolate, glabrous or
scabrous, apex acute or acuminate, both exceeding the floret body; lower glumes 1-veined; upper
glumes 1−3-veined, glabrous or scabrous along the median vein; lemmas membranous, glabrous or
scabrous, usually smooth, 5-veined, apex acute, bifid, dentate or aristidate, usually awned dorsally from
upper, middle or lower third, rarely mucronate; paleas usually slightly shorter than the lemma to as
long, membranous, sometimes hyaline, 2-veined, 2-keeled; callus rounded, recurved or acute, hairy,
rarely glabrous, the hairs shorter, as long or longer than the floret; stamens 3; ovary usually glabrous,

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Peterson et al.: New grass combinations and names
styles 2, stigmas feathery; lodicules 2, membranous, generally with 2 unequal lobes, glabrous or
sometimes ciliate. Caryopses usually fusiform to oblong, sometimes laterally compressed, pericarp
adherent, endosperm dry, pasty, or liquid. Basic chromosome number x = 7.
Distribution―Species of Cinnagrostis range throughout South America and extend to Central
America, C. rigescens (J. Presl) P.M. Peterson, Soreng, Romasch. & Barberá reaching North America
in Veracruz, Mexico (Tovar 1993; Rúgolo de Agrasar & Villavicencio 1998; Rúgolo de Agrasar 2006,
2012).
Comments―In a molecular phylogeny based on four gene regions (ITS, rpl32-trnL spacer,
rps16-trnK spacer, and rps16 intron) [henceforth referred to as Romaschenko et al. (in prep.)] the South
American species of Calamagrostis and Deyeuxia form a clade sister to the Mexican and Central
American species of Trisetum, Calamagrostis, and Peyritschia (most transferred below to Peyritschia),
within the Koeleriinae clade B of the Aveninae J. Presl. Within the Cinnagrostis clade are two
subclades, one containing species formerly placed in Calamagrositis sect. Chamaecalamus Pilg. [more
recently placed in Deyeuxia sect. Chamaecalamus (Pilg.) Rúgolo & Villav.], which is sister to the
remaining species in the genus (Pilger 1938; Rúgolo de Agrasar & Villavicencio 1995).
Cinnagrostis alba (J. Presl) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.* Basionym:
Deyeuxia alba J. Presl, Reliq. Haenk. 1 (4–5): 248. 1830.
Cinnagrostis alba var. breviaristata (Rúgolo) P.M. Peterson, Soreng, Romasch. & Barberá, comb.
nov.* Basionym: Deyeuxia alba subsp. breviaristata Rúgolo, Darwiniana 44 (1): 146–147, f.
4C–D. 2006.
Cinnagrostis alba var. tricholemma (Roseng., B.R. Arrill. & Izag.) P.M. Peterson, Soreng, Romasch.
& Barberá, comb. nov.* Basionym: Calamagrostis alba subsp. tricholemma Roseng., B.R.
Arrill. & Izag., Gram. Urug. 27, f. 4. 1970.
Cinnagrostis boliviensis (Hack.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Calamagrostis boliviensis Hack., Repert. Spec. Nov. Regni Veg. 6: 156. 1908.
Cinnagrostis breviaristata (Wedd.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Deyeuxia breviaristata Wedd., Bull. Soc. Bot. France 22: 177, 179. 1875.
Cinnagrostis brevifolia (J. Presl) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Deyeuxia brevifolia J. Presl, Reliq. Haenk. 1 (4–5): 248. 1830.
Cinnagrostis brevifolia var. expansa (Rúgolo & Villav.) P.M. Peterson, Soreng, Romasch. & Barberá,
comb. nov. Basionym: Deyeuxia brevifolia var. expansa Rúgolo & Villav., Bol. Soc. Argent.
Bot. 31 (1–2): 125. 1995.
Cinnagrostis cabrerae (Parodi) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Calamagrostis cabrerae Parodi, Revista Argent. Agron. 15 (1): 59, f. 3. 1948.
Cinnagrostis cabrerae var. aristulata (Rúgolo & Villav.) P.M. Peterson, Soreng, Romasch. &
Barberá, comb. nov. Basionym: Deyeuxia cabrerae var. aristulata Rúgolo & Villav., Bol. Soc.
Argent. Bot. 31 (1–2): 126, f. 1. 1995.
Cinnagrostis cabrerae var. maxima (Rúgolo) P.M. Peterson, Soreng, Romasch. & Barberá, comb.
nov. Basionym: Deyeuxia cabrerae var. maxima Rúgolo, Parodiana 4 (1): 106, f. 3a–e. 1986.

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Peterson et al.: New grass combinations and names
Cinnagrostis cabrerae var. trichopoda (Parodi ex Rúgolo) P.M. Peterson, Soreng, Romasch. &
Barberá, comb. nov. Basionym: Deyeuxia cabrerae var. trichopoda Parodi ex Rúgolo,
Parodiana 4 (1): 107, f. 3f–k. 1986.
Cinnagrostis calderillensis (Pilg.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Calamagrostis calderillensis Pilg., Bot. Jahrb. Syst. 42 (1): 72. 1908.
Cinnagrostis chrysophylla (Phil.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Deyeuxia chrysophylla Phil., Verz. Antofagasta Pfl. 83. 1891.
Cinnagrostis ciliata (Rúgolo & Villav.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Deyeuxia ciliata Rúgolo & Villav., Bol. Soc. Argent. Bot. 31 (1–2): 126, f. 2. 1995
(≡ Calamagrostis cordechii Govaerts).
Cinnagrostis ciliata var. glabrescens (Rúgolo & Villav.) P.M. Peterson, Soreng, Romasch. & Barberá,
comb. nov. Basionym: Deyeuxia ciliata var. glabrescens Rúgolo & Villav., Bol. Soc. Argent.
Bot. 31 (1–2): 128, f. 3. 1995.
Cinnagrostis coarctata (Kunth) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Deyeuxia coarctata Kunth, Nov. Gen. Sp. (quarto ed.) 1: 143. 1815 (1816) (≡ Calamagrostis
fibrovaginata Lægaard, non Calamagrostis coarctata Eaton).
Cinnagrostis crispa (Rúgolo & Villav.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Deyeuxia crispa Rúgolo & Villav., Bol. Soc. Argent. Bot. 31 (1–2): 128, f. 4. 1995.
Cinnagrostis cryptolopha (Wedd.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Calamagrostis cryptolopha Wedd., Bull. Soc. Bot. France 22: 176, err. typ. 156,
179. 1875.
Cinnagrostis curta (Wedd.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.* Basionym:
Deyeuxia curta Wedd., Bull. Soc. Bot. France 22: 156 (176), 179. 1875.
Cinnagrostis curvula (Wedd.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Deyeuxia curvula Wedd., Bull. Soc. Bot. France 22: 178, 179. 1875.
Cinnagrostis cuzcoensis (Tovar) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.*
Basionym: Calamagrostis cuzcoensis Tovar, Publ. Mus. Hist. Nat. Javier Prado, Ser. B, Bot.
33: 11. 1985.
Cinnagrostis densiflora (J. Presl) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Deyeuxia densiflora J. Presl, Reliq. Haenk. 1 (4–5): 247. 1830.
Cinnagrostis deserticola (Phil.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Deyeuxia deserticola Phil., Fl. Atacam. 55. 1860.
Cinnagrostis deserticola var. breviaristata (Rúgolo & Villav.) P.M. Peterson, Soreng, Romasch. &
Barberá, comb. nov. Basionym: Deyeuxia deserticola var. breviaristata Rúgolo & Villav., Bol.
Soc. Argent. Bot. 31 (1–2): 134, f. 6. 1995.

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Peterson et al.: New grass combinations and names
Cinnagrostis divergens (Swallen) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.*
Basionym: Calamagrostis divergens Swallen, Contr. U.S. Natl. Herb. 29 (6): 262–263. 1948
(1949).
Cinnagrostis fiebrigii (Pilg.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Calamagrostis fiebrigii Pilg., Bot. Jahrb. Syst. 42 (1): 68. 1908.
Cinnagrostis filifolia (Wedd.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Deyeuxia filifolia Wedd., Bull. Soc. Bot. France 22: 178, 179. 1875 [= Calamagrostis amoena
(Pilg.) Pilg.].
Cinnagrostis filifolia var. festucoides (Wedd.) P.M. Peterson, Soreng, Romasch. & Barberá, comb.
nov. Basionym: Deyeuxia festucoides Wedd., Bull. Soc. Bot. France 22: 178, 179. 1875 [=
Calamagrostis amoena var. festucoides (Wedd.) Soreng].
Cinnagrostis fuscata (J. Presl) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Deyeuxia fuscata J. Presl, Reliq. Haenk. 1 (4–5): 249. 1830.
Cinnagrostis glacialis (Wedd.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Deyeuxia glacialis Wedd., Bull. Soc. Bot. France 22: 178–179. 1875.
Cinnagrostis heterophylla (Wedd.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Deyeuxia heterophylla Wedd., Bull. Soc. Bot. France 22: 177, 180. 1875 (=
Calamagrostis swallenii Tovar).
Cinnagrostis hieronymi (Hack.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Calamagrostis hieronymi Hack., Oesterr. Bot. Z. 52 (3): 109. 1902.
Cinnagrostis hirsuta (Rúgolo & Villav.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Deyeuxia hirsuta Rúgolo & Villav., Bol. Soc. Argent. Bot. 31 (1–2): 136, f. 7. 1995
(≡ Calamagrostis menhoferi Govaerts).
Cinnagrostis hirta (Sodiro) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.* Basionym:
Deyeuxia hirta Sodiro, Revista Colegio Nac. Vicente Rocafuerte 12: 64, 75. 1930.
Cinnagrostis intermedia (J. Presl) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Deyeuxia intermedia J. Presl, Reliq. Haenk. 1 (4–5): 249. 1830.
Cinnagrostis involuta (Swallen) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.*
Basionym: Calamagrostis involuta Swallen, Contr. U.S. Natl. Herb. 29 (6): 259. 1948 (1949).
Cinnagrostis jamesonii (Steud.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Calamagrostis jamesonii Steud., Syn. Pl. Glumac. 1: 191. 1855 (1854).
Cinnagrostis lagurus (Wedd.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.* Basionym:
Deyeuxia lagurus Wedd., Bull. Soc. Bot. France 22: 156 (176). 1875 (≡ Calamagrostis
cephalantha Pilg.).
Cinnagrostis leiophylla (Wedd.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.*
Basionym: Deyeuxia leiophylla Wedd., Bull. Soc. Bot. France 22: 177, 180. 1875.

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Peterson et al.: New grass combinations and names
Cinnagrostis macrophylla (Pilg.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Deyeuxia macrophylla Pilg., Bot. Jahrb. Syst. 25 (5): 711–712. 1898.
Cinnagrostis macrostachya (Sodiro) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.*
Basionym: Deyeuxia macrostachyum Sodiro, Revista Colegio Nac. Vicente Rocafuerte 12: 64,
74. 1930.
Cinnagrostis malamalensis (Hack.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Calamagrostis malamalensis Hack., Anales Mus. Nac. Buenos Aires 13: 478. 1906.
Cinnagrostis mandoniana (Wedd.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Deyeuxia mandoniana Wedd., Bull. Soc. Bot. France 22: 179, 180. 1875.
Cinnagrostis micrathera (E. Desv.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Trisetum micratherum E. Desv., Fl. Chil. 6: 352. 1854 (≡ Leptophyllochloa
micrathera (E. Desv.) C.E. Calderón).
Cinnagrostis minima (Pilg.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Calamagrostis vicunarum var. minima Pilg., Pilg. Bot. Jahrb. Syst. 42: 63. 1908.
Cinnagrostis mollis (Pilg.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.* Basionym:
Calamagrostis mollis Pilg., Bot. Jahrb. Syst. 42 (1): 61. 1908.
Cinnagrostis mulleri (Luces) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.* Basionym:
Calamagrostis mulleri Luces, Bol. Soc. Venez. Ci. Nat. 15 (80): 9–11, f. 5. 1953.
Cinnagrostis nitidula (Pilg.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Calamagrostis nitidula Pilg., Bot. Jahrb. Syst. 42 (1): 69. 1908.
Cinnagrostis orbignyana (Wedd.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Deyeuxia orbignyana Wedd., Bull. Soc. Bot. France 22: 178, 180. 1875.
Cinnagrostis patagonica (Speg.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.*
Basionym: Deyeuxia patagonica Speg., Anales Mus. Nac. Hist. Nat. Buenos Aires 7: 191.
1902.
Cinnagrostis polygama Griseb., Abh. Königl. Ges.Wiss. Göttingen 19: 257, t.2, f. 7. 1874. Figure
1A−G.
Cinnagrostis polygama var. filifolia (Rúgolo & Villav.) P.M. Peterson, Soreng, Romasch. & Barberá,
comb. nov. Basionym: Deyeuxia polygama var. filifolia Rúgolo & Villav., Bol. Soc. Argent.
Bot. 31(1–2): 139, f. 8. 1995.
Cinnagrostis preslii (Kunth) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Agrostis preslii Kunth, Enum. Pl. 1: 225. 1833 (≡ Agrostis caespitosa J. Presl, nom. illeg. hom.
non. (L.) Salisb. ≡ Deyeuxia nana Rúgolo).
Cinnagrostis rauhii (Tovar) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Calamagrostis rauhii Tovar, Mem. Mus. Hist. Nat. "Javier Prado" 11: 78. 1960.

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Peterson et al.: New grass combinations and names
Figure 1. Illustration of Cinnagrostis polygama from Argentina; drawn by Victor Dudas. A. Habit. B.
Ligule. C. Spikelet. D. Floret. E. Lemma apex. F. Palea apex. G. Pistil and lodicules.

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Peterson et al.: New grass combinations and names
Cinnagrostis recta (Kunth) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Deyeuxia recta Kunth, Nov. Gen. Sp. (quarto ed.) 1: 144–145. 1815 (1816).
Cinnagrostis reitzii (Swallen) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.* Basionym:
Calamagrostis reitzii Swallen, Sellowia 7: 11. 1956.
Cinnagrostis rigescens (J. Presl) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Agrostis rigescens J. Presl, Reliq. Haenk. 1 (4–5): 237. 1830.
Cinnagrostis rigida (Kunth) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Deyeuxia rigida Kunth, Nov. Gen. Sp. (quarto ed.) 1: 144. 1815 (1816).
Cinnagrostis rosea (Griseb.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Agrostis rosea Griseb., Abh. Königl. Ges. Wiss. Göttingen 19: 253–254. 1874.
Cinnagrostis rupestris (Trin.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Calamagrostis rupestris Trin., Gram. Panic. 28. 1826.
Cinnagrostis scaberula (Swallen) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Calamagrostis scaberula Swallen, Contr. U.S. Natl. Herb. 29 (6): 261. 1948
(1949).
Cinnagrostis sclerantha (Hack.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.*
Basionym: Calamagrostis sclerantha Hack., Oesterr. Bot. Z. 52 (3): 108. 1902.
Cinnagrostis setiflora (Wedd.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Deyeuxia setiflora Wedd., Bull. Soc. Bot. France 22: 176, 180. 1875.
Cinnagrostis spicigera (J. Presl) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Deyeuxia spicigera J. Presl, Reliq. Haenk. 1 (4–5): 247. 1830.
Cinnagrostis spicigera var. cephalotes (Wedd.) P.M. Peterson, Soreng, Romasch. & Barberá, comb.
nov. Basionym: Deyeuxia cephalotes Wedd., Bull. Soc. Bot. France 22: 178, 179. 1875.
Cinnagrostis steyermarkii (Swallen) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.*
Basionym: Calamagrostis steyermarkii Swallen, Contr. U.S. Natl. Herb. 29 (6): 258–259. 1948
(1949).
Cinnagrostis tarmensis (Pilg.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Calamagrostis tarmensis Pilg., Bot. Jahrb. Syst. 42 (1): 70. 1908.
Cinnagrostis tarmensis var. macrochaeta (Hack. ex R.E. Fr.) P.M. Peterson, Soreng, Romasch. &
Barberá, comb. nov. Basionym: Calamagrostis rosea var. macrochaeta Hack. ex R.E. Fr., Ark.
Bot. 8 (8): 40. 1908 (1909).
Cinnagrostis trichodonta (Wedd.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Deyeuxia trichodonta Wedd., Bull. Soc. Bot. France 22: 156 (176), 180. 1875.
Cinnagrostis trichodonta var. hirsuta (Rúgolo) P.M. Peterson, Soreng, Romasch. & Barberá, comb.
nov. Basionym: Deyeuxia trichodonta var. hirsuta Rúgolo, Darwiniana 44(1): 254, f. 47. 2006.

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Peterson et al.: New grass combinations and names
Cinnagrostis velutina (Nees & Meyen) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Deyeuxia velutina Nees & Meyen, Gramineae 15–16. 1841.
Cinnagrostis velutina var. nardifolia (Griseb.) P.M. Peterson, Soreng, Romasch. & Barberá, comb.
nov. Basionym: Agrostis nardifolia Griseb., Abh. Königl. Ges. Wiss. Göttingen 19: 252–253.
1874.
Cinnagrostis vicunarum (Wedd.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Deyeuxia vicunarum Wedd., Bull. Soc. Bot. France 22: 177, 180. 1875.
Cinnagrostis violacea (Wedd.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Deyeuxia violacea Wedd., Bull. Soc. Bot. France 22: 179, 180. 1875.
Cinnagrostis violacea var. puberula (Rúgolo & Villav.) P.M. Peterson, Soreng, Romasch. & Barberá,
comb. nov. Basionym: Deyeuxia violacea var. puberula Rúgolo & Villav., Bol. Soc. Argent.
Bot. 31 (1–2): 139. 1995.
Cinnagrostis viridiflavescens (Poir.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Arundo viridiflavescens Poir., Encycl. 6: 271. 1804.
Cinnagrostis viridiflavescens var. montevidensis (Nees) P.M. Peterson, Soreng, Romasch. &
Barberá, comb. nov. Basionym: Calamagrostis montevidensis Nees, Fl. Bras. Enum. Pl. 2 (1):
401. 1829.
Cinnagrostis viridis (Phil.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Deyeuxia viridis Phil., Linnaea 33 (3–4): 288. 1865.
DESCHAMPSIA P.Beauv., Ess. Agrostogr. 91, pl. 18, f. 3. 1812. TYPE: Deschampsia cespitosa (L.) P.
Beauv. [≡ Aira cespitosa L. ≡ Agrostis caespitosa (L.) Salisb. ≡ Avena caespitosa (L.) Kuntze
≡ Campella caespitosa (L.) Link ≡ Podionapus caespitosus (L.) Dulac].
Comments―We report 12 western hemisphere taxa usually treated in Calamagrostis,
Deyeuxia, or Scribneria Hack., transferred into Deschampsia by Saarela et al. (2017), along with new
combinations, all except three supported by our molecular phylogeny (Romaschenko et al. in prep).
Two morphologically similar taxa published by Sylvester (2019) have not yet been tested. We choose
not to emend the generic description at this time but note all these species of Deschampsia (subtribe.
Aristaveninae F. Albers & Butzin) generally have 1(−2)-flowered spikelets, stipitate basal florets [the
rachilla below the floret is slightly elongated raising it above the glumes as in Stylagrostis Mez], long
membranous ligules (usually 6−20 mm long), smooth or nearly so, glabrous, often with flanking
auriculate lobes and decurrent along the sheath margins, shinny and lustrous glumes (Escalona 1988;
Saarela et al. 2017), and caryopses with solid endosperm.
Deschampsia ampliflora (Tovar) Romasch., P.M. Peterson, Soreng & Barberá, comb. nov.*
Basionym: Calamagrostis amplifora Tovar, Mem. Mus. Hist. Nat. Javier Prado 11: 16. 1960.
Deschampsia aurea (Munro ex Wedd.) Saarela, PhytoKeys 87: 87. 2017. Basionym: Deyeuxia aurea
Munro ex Wedd., Bull. Soc. Bot. France 22: 176 (156), 179. 1875 (1876).
Deschampsia bolanderi (Thurb.) Saarela, PhytoKeys 87: 90. 2017. Basionym: Lepturus bolanderi
Thurb., Proc. Amer. Acad. Arts 7: 401. 1868. [≡ Scribneria bolanderi (Thurb.) Hack.].

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Peterson et al.: New grass combinations and names
Deschampsia boyacensis (Swallen & García-Barr) Romasch., P.M. Peterson, Soreng & Barberá,
comb. nov.* Basionym: Calamagrostis boyacensis Swallen & García-Barr, Caldasia 2(8): 302,
f. D. 1943.
Deschampsia chrysantha (J. Presl) Saarela, PhytoKeys 87: 88. 2017. Basionym: Deyeuxia chrysantha
J. Presl, Reliq. Haenk. 1 (4−5): 247. 1840.
Deschampsia chrysantha var. phalaroides (Wedd.) Saarela, PhytoKeys 87: 88. 2017. Basionym: Wedd.
Bull. Soc. Bot. France 22: 177, 180. 1875.
Deschampsia chrysostachya (E. Desv.) Romasch., P.M. Peterson, Soreng & Barberá, comb. nov.
Basionym: Deyeuxia chrysostachya E. Desv. Fl. Chil. 6: 323, t. 78, f. 2. 1854.
Deschampsia eminens (J. Presl) Saarela, PhytoKeys 87: 89. 2017. Basionym: Deyeuxia eminens J.
Presl, Reliq. Haenk. 1 (4–5): 250. 1830.
Deschampsia eminens var. discreta (Rúgolo & Villav.) Romasch., P.M. Peterson, Soreng & Barberá,
comb. nov. Basionym: Deyeuxia eminens var. discreta Rúgolo & Villav., Bol. Soc. Argent.
Bot. 31(1–2): 135. 1995.
Deschampsia eminens var. fulva (Griseb.) Saarela, PhytoKeys 87: 89. 2017. Basionym: Agrostis fulva
Griseb., Abh. Königl. Ges. Wiss. Göttingen 24: 294. 1879.
Deschampsia eminens var. inclusa (Rúgolo) Saarela, PhytoKeys 87: 90. 2017. Basionym: Deyeuxia
eminens var. inclusa Rúgolo, Darwiniana 44 (1): 195, f. 24. 2006.
Deschampsia gayana (Steud.) Romasch., P.M. Peterson, Soreng & Barberá, comb. nov. Basionym:
Aira gayana Steud., Syn. Pl. Glumac. 1: 220. 1855 (1854). (other name: Deyeuxia
erythrostachya E. Desv.).
Deschampsia gayana var. neuquenensis (Rúgolo) Romasch., P.M. Peterson, Soreng & Barberá,
comb. nov.* Basionym: Deyeuxia erythrostachya var. neuquenensis Rúgolo, Darwiniana
19(2–4): 410, f. 3. 1975.
Deschampsia hackelii (Lillo) Saarela, Phytokeys 87: 87. 2017. Basionym: Calamagrostis hackelii
Lillo, Anales Mus. Nac. Buenos Aires 21: 100, t. 4, f. A. 1–5. 1911.
Deschampsia ovata (J. Presl) Saarela, PhytoKeys 87: 88. 2017. Basionym: Deyeuxia ovata J. Presl,
Reliq. Haenk. 1(4–5): 246. 1830.
Deschampsia ovata var. nivalis (Wedd.) Saarela, PhytoKeys 87: 88. 2017. Basionym: Deyeuxia nivalis
Wedd., Bull. Soc. Bot. France 22: 176, 180. 1875.
Deschampsia parodiana (Kunth) Saarela, PhytoKeys 87: 90. 2017. Basionym: Deyeuxia ligulata
Kunth, Nov. Gen. Sp. (quarto ed.) 1: 145. 1815 (1816).
Deschampsia podophora (Pilg.) Saarela, PhytoKeys 87: 90. 2017. Basionym: Calamagrostis
podophora Pilg., Bot. Jahrb. Syst. 42 (1): 66. 1908.
Deschampsia podophora var. mutica Sylvester*, PhytoKeys 122: 63−66, f. 3. 2019.

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Peterson et al.: New grass combinations and names
Deschampsia santamartensis Sylvester & Soreng*, PhytoKeys 122: 56−59, f. 2. 2019.
Deschampsia teretifolia (Lægaard) Romasch., P.M. Peterson, Soreng & Barberá, comb. nov.
Basionym: Calamagrostis teretifolia Lægaard, Novon 8 (1): 27, f. 1E. 1998.
GREENEOCHLOA P.M. Peterson, Soreng, Romasch. & Barberá, gen. nov. TYPE: Greeneochloa
coarctata (Eaton) P.M. Peterson, Soreng, Romasch. & Barberá (≡ Calamagrostis coarctata
Eaton).
Diagnosis―Differing from Calamagrostis Adans. in having hairy ovaries, extravaginal shoot
innovations, flat leaf blades, and panicles contracted usually with ascending tightly appressed or
slightly spreading branches.
Description―Loosely cespitose perennials with rhizomes 1−10 cm long, 2−4 mm thick.
Culms (47−)60−200 cm tall, 3−8 mm in diameter, unbranched, smooth to scabrous with extravaginal
shoot innovations below; nodes 2−5(−6), glabrous. Leaf sheaths shorter than the internodes, smooth or
scabrous, sometimes inflated near summit, glabrous or sparingly hairy, culm sheath margins fused at
the base for a few mm; collars smooth to scabrous, sometimes hairy; ligules (1−)3−6(−12) mm long,
hyaline to chartaceous, obtuse to truncate, rarely acute, often erose or lacerate, abaxially scabrous to
scaberulous; blades (3−)4−35(−45) cm long, (2−)3−15 mm wide, flat, glabrous below, glabrous and
scabrous to hairy above, margins sometimes hairy. Panicles 7−25 cm long, (0.8−)1−3 cm wide,
terminal, contracted sometimes interrupted near base, greenish to purplish or yellowish; branches
ascending and loosely to tightly appressed, nearly smooth to densely scabrous, sometimes naked below.
Spikelets (4.5−)5−8(−9) mm long, 1(−2)-flowered, laterally compressed; rachilla prolongation
(0.5−)1−2(−4) mm long, hairy or glabrous and hairy at the apex, the hairs 1−4 mm long, whitish;
disarticulation above the glumes; glumes usually longer to as long as the florets, acuminate, scabrous
along the midvein, margins often hyaline; lower glumes 1 or 3-veined; upper glumes usually 3-veined;
lemmas 4−6.5(−7.5) mm long, lanceolate, chartaceous to membranous, scaberulous, 5-veined, dorsally
awned from the lower 1/5 to upper ¾ or at the apex, the awns 1−10 mm long, straight or bent, apex
entire or 4-toothed; callus hairy, the hairs (0.8−)1−5 mm long; paleas shorter than the lemmas, 2-keeled,
apex acuminate, body sub-chartaceous or scareous, gap between keels about as broad as outer flanges;
stamens 3, anthers 1.5−4 mm long; ovaries with scattered or dense hairs, at least at the apex, styles 2,
stigmas feathery; lodicules 2, membranous, lobed, glabrous or pubescent. Caryopses 2−3 mm long,
ovoid to fusiform, slightly compressed, sulcus prominent, hilum 1/3 the grain in length, endosperm dry,
hard, pericarp adherent.
Etymology―The new genus honors Craig William Greene (1949−2003), an American
taxonomist who focused on agamic complexes in polyploid species of Calamagrostis and Amelanchier
Medik.
Distribution―Greeneochloa occurs in Oregon, Washington, and Montana (G. tweedyi), and
extending in eastern North America from Nova Scotia and Maine to Georgia and Louisiana (G.
coarctata) [Marr. et al. 2007].
Comments―In Romaschenko et al. (in prep.) the two species of Greeneochloa form a clade
within subtribe Echinopogoninae which is sister to subtribe Calothecinae plus Calamagrostis s.s.
(subtribe. Agrostidinae Fr.) all in supersubtrib. Agrostidodinae Soreng [Soreng et al. 2017; Peterson al.
in prep.].
Greeneochloa coarctata (Eaton) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Calamagrostis coarctata Eaton, Man. Bot. 144. 1829 (Calamagrostis cinnoides W.P.C. Barton
is misapplied to this species ≡ Calamagrostis canadensis Michx.). Figure 2.

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Peterson et al.: New grass combinations and names
Figure 2. Greeneochloa coarctata collected by L.J. Lehtonen & S.M. Young 62 (US) in Maryland, USA.

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Peterson et al.: New grass combinations and names
Greeneochloa tweedyi (Scribn.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Deyeuxia tweedyi Scribn., Bull. Torrey Bot. Club 10: 64. 1883 [≡ Calamagrostis tweedyi
(Scribn.) Scribn.].
LAEGAARDIA P.M. Peterson, Soreng, Romasch. & Barberá, gen. nov. TYPE: Laegaardia ecuadoriense
(Lægaard) P.M. Peterson, Soreng, Romasch. & Barberá (≡ Calamagrostis ecuadoriensis
Lægaard).
Diagnosis―Differing from Paramochloa P.M. Peterson, Soreng, Romasch. & Barberá in
having unawned lemmas, two 3-veined glumes, and culms 11−42 cm tall.
Description―Cespitose perennials. Culms 11−42 cm tall, about 1 mm diameter, erect,
furrowed, smooth to hispid with intravaginal shoot innovations below. Basal leaves with short sheaths,
the sheaths 2−3(−5) cm long, shallowly furrowed, glabrous, fibrous in age; ligules 0.5−1 mm long,
truncate; collar distinct ±swollen; leaf blades 3−7 cm long, 0.3−1 mm wide, tightly involute, abaxially
furrowed, glabrous, adaxially deeply furrowed, finely hispid. Culm leaves with long sheaths, upward
slightly inflated, membranous; auricles higher than ligule; leaf blades 1−5 cm long, involute; flag leaf
1‒1.5 cm long. Panicles 8−14 cm long, 0.7−1.6 cm wide, narrow, the axis, branches and pedicels
glabrous to hispid, usually dark purplish; branching verticillate on lower nodes. Spikelets 1(2)-
flowered, laterally compressed; rachilla prolongation 1.4−1.6 mm long with hairs almost reaching the
apex of the lemma; disarticulation above the glumes; glumes 3.5−4 mm,long, subequal, both 3-veined
with lateral veins rather faint, broadly lanceolate, apex obtuse to acute, finely erose, keeled toward
apex, scabrid and mat on and between veins, glabrous and shining along margin; floret on short stipe
about 0.15 mm long; lemmas 2.7−3.1 mm long, ovate, membranous, 5-veined, apex obtuse,to
irregularly minutely-toothed, scabrid on back, awn lacking; callus hairy, the hairs 1−1.5 mm long;
paleas 1.9‒2.7 mm long, shorter than the lemma, 2-veined, scareous, keels scabrid with a narrow gap
between them and broad lateral flanges; stamens 3, anthers 0.8−1 mm long, purple; ovaries glabrous,
styles 2, distinctly gapped, stigmas feathery; lodicules 2, membranous. Caryopses 1.2−1.4 mm long,
elliptical-ovoid, slightly compressed, sulcate, hilum linear 1/3 the grain in length, embryo small,
endoperm solid, pericarp adherent.
Etymology―The new genus honors Simon Lægaard (1933–), a renowned Danish Botanist,
who has made extensive collections in Ecuador, Greenland, and South America.
Distribution―The single species in Laegaardia is endemic to Ecuador where it has been
found in the Provinces of Azuay, Chimborazo, Loja [Lægaard 18999, 19111, 19339 (AAU, QCA, US)],
Napo, and Pichincha (Lægaard 1998).
Comments―Laegaardia ecuadoriense is a strongly supported sister to Paramochloa
crispifolia (Sylvester) P.M. Peterson, Soreng, Romasch. & Barberá plus P. effusa (Kunth) P.M.
Peterson, Soreng, Romasch. & Barberá within subtribe Calothecinae (Soreng 2015; Romaschenko et
al. in prep.).
Laegaardia ecuadoriense (Lægaard) P.M. Peterson, Soreng, Romasch. & Barberá, comb.
nov. Basionym: Calamagrostis ecuadoriensis Lægaard, Novon 8 (1): 25–26, f. 1B. 1998. Figure 3.
PARAMOCHLOA P.M. Peterson, Soreng, Romasch. & Barberá, gen. nov. TYPE: Paramochloa effusa
(Kunth) P.M. Peterson, Soreng, Romasch. & Barberá [≡ Deyeuxia effusa Kunth ≡
Calamagrostis effusa (Kunth) Steud.].
Diagnosis―Differing from Laegaardia P.M. Peterson, Soreng, Romasch. & Barberá in having
awned lemmas, 1-veined lower glumes, and culms 40−100 cm tall.

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Peterson et al.: New grass combinations and names
Figure 3. Isotype of Laegaardia ecuadoriense collected by S. Lægaard 53295 (US) in Ecuador.

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Peterson et al.: New grass combinations and names
Description―Cespitose perennials, forming dense mats sometimes appearing below as short
vertical or oblique rhizomes. Culms 40−100 cm tall, 1−2.5 mm diameter, erect, smooth, with
intravaginal shoot innovations below. Basal leaf sheaths becoming fibrous below, the sheaths shorter
than the internodes; ligules 2.2−10 mm long, truncate, obtuse to acute; leaf blades 5−30 cm long, 0.5−3
mm wide, involute, stiffly erect or strongly curled, readily or tardily deciduous with age breaking off
at ligule insertion tending to form a J at base after falling leaving the ligule exposed. Panicles
(5.5−)9−20 cm long, 3−10 cm wide, open to somewhat contracted, the axis, branches and pedicels
terete, smooth to scabrous, purplish; branching verticillate on lower nodes. Spikelets 1-flowered, not
strongly laterally compressed; rachilla prolongation 1.6−5.5 mm long, hairy, the hairs 0.5−1.2 mm long,
sometimes exceeding the apex of the lemma; disarticulation above the glumes; glumes 3−5.5 mm long,
as long or longer than the florets, subequal, lanceolate, membranous, scaberulous distally, purplish,
lustrous; lower glumes 1-veined; upper glumes 3-veined, the lateral veins present on lower 1/3−1/2,
with 1 or 2 cross veins between the keel and lateral vein infrequently present in ca. 10% of spikelets
seen (requires 25x magnification); floret sessile; lemmas 2.9−4.6 mm long, 5-veined, lanceolate,
membranous, glabrous to scabrous, lustrous, awned dorsally, apex emarginate with finely denticulate
lobes; awns 2−7.2 mm long, inserted from near the middle, geniculate and twisted near base; callus
rounded with a tuft of hairs, the hairs 0.2−0.8 mm long; paleas shorter than the lemma, 2-veined,
membranous, apex bidentate; stamens 3, anthers 1.5−2.7 mm long; ovaries glabrous, styles 2, separated,
stigmas feathery; lodicules 2, 2-lobed, membranous. Caryopses 1.8−2 mm long, ovate, sulcus shallow,
hilum linear, 1/3-1/2 the grain in length, embryo small, endosperm dry, hard, pericarp adherent.
Distribution―The two South American species of Paramochloa occur in the paramos of
Colombia, Ecuador, and Venezuela.
Comments―In a molecular phylogeny based on four gene regions (ITS, rpl32-trnL spacer,
rps16-trnK spacer, and rps16 intron), Paramochloa crispifolia and P. effusa form a clade sister to
Laegaardia ecuadoriense within subtribe Calothecinae (Romaschenko et al. in prep.).
Paramochloa crispifolia (Sylvester) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Calamagrostis crispifolius Sylvester, PhytoKeys 122: 51−54, f. 1. 2019.
Paramochloa effusa (Kunth) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Deyeuxia effusa Kunth, Nov. Gen. Sp. (quarto ed.) 1: 146, t. 46. 1815 (1816). Figure 4.
PEYRITSCHIA E. Fourn., Mexic. Pl. 2: 109. 1886, gen. emend. TYPE: Peyritschia koelerioides (Peyr.)
E. Fourn. (≡ Aira koelerioides Peyr.).
Description―Perennials, cespitose or with short rhizomes. Culms 5−300 cm tall, glabrous or
pubescent. Leaf blades flat, conduplicate, convolute or involute, soft, rarely rigid; ligule membranous.
Panicles narrow, contracted to open and ovate to pyramidal. Spikelets 3−10 mm long, 1−6-flowered,
laterally compressed; rachilla hairy, rarely glabrous to scabrous, usually prolonged above the upper
floret (usually to ¾ the length of the lemma in single-flowered species); disarticulation above the
glumes and between the florets; glumes usually longer than the lower floret, isomorphic or dimorphic,
the lower 1 or 3-veined, the upper 1, 3 or 5-veined; basal floret often short stipitate; lemmas (3)5(7)-
veined, usually awned from the back, the central awn often geniculate or divaricate, apex entire or
sometimes with 2−4 short awns (extension of the lateral veins); callus usually short pilose or pubescent,
sometimes glabrous; paleas usually shorter than the lemma, tightly enclosed by margins of the lemma
or loosely enclosed, 2-keeled, hyaline; stamens 2 or 3, anthers 0.5−3.5 mm long; lodicules 2,
membranous; ovary glabrous or hairy. Caryopses compressed, hilum < 1/5 the grain in length,
endosperm liquid, soft or pasty, or hard, pericarp adherent. Basic chromosome number x = 7.

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Peterson et al.: New grass combinations and names
Figure 4. Paramochloa effusa collected by J. Cuatrecasas 18982 (USF) in Dpto. Cauca, Colombia.

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Peterson et al.: New grass combinations and names
Distribution―Species of Peyritschia primarily range throughout Mexico and Central America
with a few species extending into South America as far south as Bolivia.
Comments―In Romaschenko et al. (in prep.) the former Mexican and Central American
species of Trisetum, Calamagrostis, and those previously placed in Peyritschia form a clade
(Peyritschia clade) sister to Cinnagrostis within the Koeleriinae clade B of the Aveninae (Finot et al.
2004, 2006; Peterson et al. 2004; Romaschenko et al. in prep.). The traditional seven species treated
in Peyritschia s.s. (Finot et al. 2004, 2006) also form a clade nested within the expanded Peyritschia
s.l. treated here.
Peyritschia angusta (Swallen) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.* Basionym:
Trisetum angustum Swallen, Phytologia 4 (7): 423. 1953.
Peyritschia bealii P.M. Peterson, Soreng, Romasch. & Barberá, nom. nov. Basionym: Calamagrostis
pringlei Scribn. ex Beal, Grass. N. Amer. 2: 345. 1896.
Peyritschia coahuilensis (P.M. Peterson, Soreng, & Valdés-Reyna) P.M. Peterson, Soreng, Romasch.
& Barberá, comb. nov. Basionym: Calamagrostis coahuilensis P.M. Peterson, Soreng, &
Valdés-Reyna, Sida 21 (1): 312, 314, f.1. 2004.
Peyritschia conferta (Pilg.) Finot, Contr. U.S. Natl. Herb. 48: 478. 2003. Basionym: Trisetum
confertum Pilg., Bot. Jahrb. Syst. 25 (5): 714. 1898.
Peyritschia curviseta (Morden & Valdés-Reyna) P.M. Peterson, Soreng, Romasch. & Barberá, comb.
nov. Basionym: Trisetum curvisetum Morden & Valdés-Reyna, Brittonia 35 (4): 375, f.1. 1983.
Peyritschia deyeuxioides (Kunth) Finot, Contr. U.S. Natl. Herb 48: 478. 2003. Basionym: Avena
deyeuxioides Kunth, Nov. Gen. Sp. (quarto ed.) 1: 147 1815 (1816) [≡ Trisetaria deyeuxioides
(Kunth) Poir. ≡ Trisetum deyeuxioides (Kunth) Kunth].
Peyritchia divaricata (P.M. Peterson & Soreng) P.M. Peterson, Soreng, Romasch. & Barberá, comb.
nov. Basionym: Calamagrostis divaricata P.M. Peterson & Soreng, Sida 21 (1): 315, f. 3. 2004.
Peyritschia durangensis (Finot & P.M. Peterson) P.M. Peterson, Soreng, Romasch. & Barberá, comb.
nov. Basionym: Trisetum durangense Finot & P.M. Peterson, Ann. Missouri Bot. Gard. 91 (1):
19–21, f.2. 2004. Figure 5A−N.
Peyritschia erectifolia (Hitchc.) P.M. Peterson, Soreng, Romasch. & Barberá, Romasch., comb. nov.
Basionym: Calamagrostis erectifolia Hitchc., N. Amer. Fl. 17 (7): 507. 1937.
Peyritschia eriantha (Kunth) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Deyeuxia eriantha Kunth, Nov. Gen. Sp. (quarto ed.) 1: 145. 1815 (1816) [≡ Arundo eriantha
(Kunth) Poir. ≡ Calamagrostis eriantha (Kunth) Steud.].
Peyritschia filifolia (Scribn. ex Beal) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Trisetum filifolium Scribn. ex Beal, Grass. N. Amer. 2: 375. 1896.
Peyritschia foliosa (Swallen) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Trisetum foliosum Swallen, Contr. U.S. Natl. Herb. 29 (6): 256–257. 1948 (1949).

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Peterson et al.: New grass combinations and names
Figure 5. Holotype illustration of Peyritschia durangensis collected by P.M. Peterson and C.R. Annable
6034 (US) in Durango, Mexico; drawn by Alice Tangerini. A. Habit. B. Inflorescence. C. Ligule. D.
Spikelet. E. Floret. F. Lower glume. G. Upper glume. H. Lemma. I. Palea, dorsal view. J. Palea, ventral
view. K. Lodicules. L. Stamens. M. Pistil. N. Caryopses.

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Peterson et al.: New grass combinations and names
Peyritschia graphephoroides P.M. Peterson, Soreng, Romasch. & Barberá, nom. nov. Basionym:
Graphephorum pringlei Scribn. ex Beal, Grass. N. Amer. 2: 561. 1896 [≡ Trisetum pringlei
(Scribn. ex Beal) Hitchc.], non Peyritschia pringlei (Scribn.) S.D. Koch.
Peyritschia howellii (Hitchc.) Finot & P.M. Peterson, Sida 22 (2) 897. 2006. Basionym: Trisetum
howellii Hitchc., Proc. Calif. Acad. Sci., ser. 4, 21 (24): 296. 1935.
Peyritschia humilis (Louis-Marie) Finot, Contr. U.S. Natl. Herb. 48: 478. 2003. Basionym: Trisetum
humile Louis-Marie, Rhodora 30: 244. 1928 (1929).
Peyritschia irazuense (Kuntze) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Calamagrostis irazuense Kuntze, Revis. Gen. Pl. 2: 763. 1891.
Peyritschia killipii (Swallen) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Calamagrostis killipii Swallen, Contr. U.S. Natl. Herb. 29 (6): 257. 1948 (1949).
Peyritschia koelerioides (Peyr.) E. Fourn., Mexic. Pl. 2: 110. 1886. Basionym: Aira koelerioides Peyr.,
Linnaea 30 (1): 5–6. 1859 [≡ Deschampsia koelerioides (Peyr.) Benth. nom illeg. hom.] [=
Graphephorum altijugum E. Fourn. ≡ Trisetum altijugum (E. Fourn.) Scribn.].
Peyritschia martha-gonzaleziae (P.M. Peterson & Finot) P.M. Peterson, Soreng, Romasch. &
Barberá, comb. nov.* Basionym: Trisetum martha-gonzaleziae P.M. Peterson & Finot, Ann.
Missouri Bot. Gard. 91 (1): 21, f.3. 2004.
Peyritschia orizabae (Rupr. ex E. Fourn.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov.
Basionym: Deyeuxia orizabae Rupr. ex E. Fourn., Bull. Soc. Bot. France 24: 181. 1877.
Peyritschia palmeri (Hitchc.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Trisetum palmeri Hitchc., Contr. U.S. Natl. Herb. 17(3): 325. 1913.
Peyritschia pinetorum (Swallen) Finot & P.M. Peterson, Sida 22 (2): 899. 2006. Basionym: Trisetum
pinetorum Scribn., Phytologia 4: 424. 1953.
Peyritschia planifolia (Kunth) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Calamagrostis planifolia Kunth, Nov. Gen. Sp. (quarto ed.) 1: 145 1815. (1816).
Peyritschia pringlei (Scribn.) S.D. Koch, Taxon 28 (1–3): 233. 1979. Basionym: Deschampsia pringlei
Scribn., Proc. Acad. Nat. Sci. Philadelphia 43 (2): 300–301, t. 13, f.1, 1a. 1891 (≡ Trisetum
kochianum Hern. Torres).
Peyritschia spellenbergii (Soreng, Finot, & P.M. Peterson) P.M. Peterson, Soreng, Romasch. &
Barberá, comb. nov. Basionym: Trisetum spellenbergii Soreng, Finot & P.M. Peterson, Ann.
Missouri Bot. Gard. 91 (1): 23–25, f.4. 2004.
Peyritschia tolucensis (Kunth) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Deyeuxia tolucensis Kunth, Nov. Gen. Sp. (quarto ed.) 1: 143. 1815 (1816) [≡ Arundo
tolucensis (Kunth) Poir. ≡ Calamagrostis tolucensis (Kunth) Trin. ex Steud.].
Peyritschia tonduzii (Hitchc.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Trisetum tonduzii Hitchc., N. Amer. Fl. 17 (8): 558. 1939.

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Peterson et al.: New grass combinations and names
Peyritschia valida (Sohns) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Calamagrostis valida Sohns, J. Wash. Acad. Sci. 46 (12): 385, f. 47–55. 1956.
Peyritschia viridis (Kunth) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Avena viridis Kunth, Nov. Gen. Sp. (quarto ed.) 1: 147. 1815 (1816) [≡ Trisetum viride (Kunth)
Kunth].
Peyritschia virletii (E. Fourn.) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Trisetum virletii E. Fourn., Mexic. Pl. 2: 108. 1886.
Peyritschia vulcanica (Swallen) P.M. Peterson, Soreng, Romasch. & Barberá, comb. nov. Basionym:
Calamagrostis vulcanica Swallen, Phytologia 4 (7): 424. 1953.
Unplaced taxa
Calamagrostis brevipaleata Swallen (probable syn. of Cinnagrostis hirta)
Calamagrostis carchiensis Lægaard (probably Peyritschia)
Calamagrostis chaseae Luces (probably Calamagrostis)
Calamagrostis cleefii Escalona (probably Peyritschia)
Calamagrostis diemii (Rúgolo) Soreng (probably Calamagrostis)
Calamgrostis fulgida Lægaard
Calamagrostis guamanensis Escalona (probably Deschampsia)
Calamagrostis leonardii Chase (Molecular data indicate this is a hybrid between Cinnagrostis and
possibly Sphenopholis Scribn. Further study is needed to confirm this result)
Calamagrostis macbridei Tovar
Calamagrostis pisinna Swallen (probably Peyritschia)
Calamagrostis pungens Tovar
Calamagrostis ramonae Escalona (probably Deschampsia)
Calamagrostis scabriflora Swallen (probably Calamagrostis)
Calamagrostis suka Speg. (probably Calamagrostis)
Deyeuxia curtoides Rúgolo & Villav. (probably Cinnagrostis)
Deyeuxia pubescens Pilg. (probably Peyritschia, possibly a syn. of P. planifolia)
Deyeuxia spruceana Wedd.
Confirmed Calamagrostis occurring in Latin America
Calamagrostis bogotensis (Pilg.) Pilg.
Calamagrostis epigeios (L.) Roth
Calamgrostis guatemalensis Hitchc.
Calamagrostis llanganatensis Lægaard
Calamagrostis neglecta (Ehrh.) G. Gaertn., B. Mey. & Scherb. s.l. [including Deyeuxia pooides
(Steud.) Rúgolo, Calamagrostis stricta (Timm) Koeler]
Calamagrostis pinetorum Swallen
Key to genera of American grasses presently or formerly treated in Calamagrostis or Deyeuxia
1. Plants from Canada or USA; caryopses hard (2).
1. Plants from Mexico, Central America or South America; caryopses soft (liquid or semi-soft) to
hard (3).

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Peterson et al.: New grass combinations and names
2. Ovary hairy; plants rhizomatous with extravaginal branching, not tufted; lemmas awned from
upper 2/5; rachilla extension glabrous except for apical tuft of hairs (G. coarctata), or lemmas awned
from middle, callus hairs short and all blades broad and flat (G. tweedyi); panicles contracted
......................................................................................................................................... Greeneochloa
2. Ovary glabrous; plants rhizomatous or not, with or without extravaginal branching, tufted or not;
lemmas awned from near base to upper 1/3; rachilla extension hairy along the length or glabrous and
rudimentary but then callus with long hairs; plants not with a combination of well-developed
rhizomes, exclusively extravaginal branching, short callus hairs, broad flat blades, and contracted
panicles; panicles open or contracted .............................................................................. Calamagrostis
3. Rachilla extension rudimentary (± 1 mm long with hairs ± 3 mm long); callus hairs mostly 1.5‒2
times longer than lemma, the callus indistinct, not angled downward or recurved
.................................................................................................... Calamagrostis epigeios (introduced)
3. Rachilla extension well developed (absent in Calamagrostis llanganatensis, short in a few other
species, but then with hairs up to 1.5 mm long); callus hairs short or long (rarely absent), as much as
1.5‒2 times longer than the lemma in a few species but the callus distinct and recurved (4).
4. Anthers 2, or 3 in plants from Mexico to Guatemala; lemma body strongly 5-veined, often
puberulent in part ………………………………………………………………………….. Peyritschia
4. Anthers 1 or 3, if 3 then plants not from Mexico (Calamagrostis guatemalensis from Guatemala);
lemma body variously veined, glabrous, sometimes scabrous (5).
5. Lemmas unawned (6).
5. Lemmas awned (8).
6. Callus and rachilla glabrous (rarely with a few short callus hairs); floret stipitate; glumes and
lemmas lustrous; panicles dense, short, globose; ligules usually elongated, decurrent and acute to
acuminate, entire or laterally cleft, smooth or nearly so; lodicules entire ....................... Deschampsia
6. Callus and rachilla hairy; floret stipitate or not; glumes and lemmas mat to sub-lustrous; panicles
various but not globose; ligules often less than 4 mm long, decurrent or not, often truncate to obtuse,
sometimes with margins taller than the midsection, usually scabrous or pubescent; lodicules often
bilobate (7).
7. Florets with a short stipe (± 0.15 mm long) between the upper glume and the callus of the floret;
both glumes 3-veined; caryopsis hard, hilum linear ± 1/3 the grain in length; plants from the páramo
in Ecuador ........................................................................................................................... Laegaardia
7. Florets sessile; lower glumes 1-veined, upper glumes 1 or 3-veined; caryopses hard to pasty, hilum
oval to punctiform < 1/4 the grain in length; plants from various locations ...................... Cinnagrostis
8. Leaf blades readily to tardily disarticulating from collars in age (tending to form a J at base after
falling), involute, sometimes sinuous; caryopsis hard, hilum linear ± 1/3 the grain in length; lower
glumes 1-veined, upper glumes 3-veined and sometimes with 1 or 2 cross-veins between them;
lemmas awned from middle, the awns 2‒7.2 mm long, basally twisted, geniculate; callus hairs 0.2‒
0.8 mm long; rachillas nearly as long as lemma, densely and evenly hairy with hairs 0.5‒1.2 mm
long; panicles open, diffuse; plants from the páramo of Colombia, Ecuador, and Venezuela
.......................................................................................................................................... Paramochloa
8. Leaf blades not disarticulating from collars in age, flat, folded or involute, not sinuous; caryopsis
soft or hard; hilum elliptical, oval, round to punctiform 1/5‒1/3 the grain in length; lower glumes 1‒3-
veined without cross-veins between them; lemmas awned from near base to upper 1/3, the awns 1‒10
mm or more long, straight, sinuous or geniculate; callus hairs absent to 4 mm long; rachillas mostly
less than ¾ the lemma in length, variously hairy, the hairs 0.5‒4 mm long, sometimes reduced or
absent proximally; panicles open (infrequently diffuse) or contracted; plants of various habitats, from
Mexico to Tierra del Fuego, Argentina (9).

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Peterson et al.: New grass combinations and names
9. Florets (occasionally a second floret developed in some spikelets) with a stipe between the upper
glume and the callus of the floret; glumes and lemmas lustrous, smooth or keels sparsely scaberulous;
lemma awns slender, not geniculate, sometimes rudimentary or absent; blades flat or somewhat rolled
inward, prominently ridged adaxially, more or less smooth (often with papillae on the long-cells
between ridges); ligules slightly to strongly decurrent, usually elongated, 4‒20 mm long, acuminate,
smooth or nearly so, glabrous, entire or laterally cleft; lodicules, glabrous …………….. Deschampsia
9. Florets sessile (very rarely with a second floret developed in some spikelets), rarely with a stipe to
0.2 mm long; glumes sometimes lustrous, usually scabrous at least on the keels, lemmas usually mat;
blades flat to involute, smooth or scabrous, often densely so (papillae absent so far as known); ligules
decurrent or not, 0.2‒10 (‒15) mm long, commonly less than 4 mm long (lateral lobes often
exceeding the central part), often scabrous or pubescent, commonly truncate to obtuse; lodicules
entire or lobed (10).
10. Caryopses hard, distinctly sulcate, hilum 1/6‒1/3 the grain in length; lemmatal awns strait or
slightly bent, readily distinguished from callus hairs, inserted from near base to middle, not or slightly
exceeding the lemma apex; callus hairs 0.1‒3 mm long 1/10‒3/4 as long as the lemma in length;
rachilla glabrous, or sparsely to densely hairy, hairs not reaching lemma apex; panicles contracted;
anthers 1 or 3; lodicules entire and lanceolate, sometimes with an isolated lateral lobe, glabrous
........................................................................................................................................ Calamagrostis
10. Caryopses soft (liquid or semi-soft) or hard, sulcate (often shallowly) or not, hilum 1/6‒1/4 the
grain in length (often obscure in species with lipid); lemmatal awns sometimes indistinguishable from
callus hairs, straight, sinuous or geniculate, capillary or stout, inserted from base to upper 1/3, usually
exceeding the lemma and often exerted from the glumes; callus hairs shorter to exceeding the lemma
in length; rachilla hairy, hairs often reaching 3/4 to exceeding the lemma length; panicles contracted
or open; anthers 3; lodicules apically bilobate or bidentate, infrequently entire and lanceolate, apical
margin sometimes ciliolate or ciliate ................................................................................ Cinnagrostis
ACKNOWLEDGEMENTS
We thank the Flora Iberica (CGL2014–52787–C3–1–P, CGL2012–32914, CGL2017-85204-
C3-1-P) and FPI fellowship BES-2012-053754 to P. Barberá; the National Geographic Society
Committee for Research and Exploration (Grant No. 8848-10, 8087-06) for field and laboratory
support; the Smithsonian Institution’s Restricted Endowments Fund, the Scholarly Studies Program,
Research Opportunities, Atherton Seidell Foundation, Biodiversity Surveys and Inventories Program,
Small Grants Program, the Laboratory of Analytical Biology; and the United States Department of
Agriculture. We thank Neil Snow and Jesus Valdés Reyna for suggesting changes to the manuscript,
Alice Tangerini and Victor Dudas for preparing the illustrations, and Guy Nesom for editing the final
version.
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