Fig 5 - uploaded by Michael O. Dillon
Content may be subject to copyright.
Pseudognaphalium paramorum. Photograph of holotype collection of Gnaphalium paramorum S.F.Blake, A. Jahn 883 (US1186590, img00129548).
Source publication
Gnaphaliothamnus nesomii M.O. Dillon & Luebert (Asteraceae: Gnaphalieae) is a new species from the Sierra de los Cuchumatanes, Department Huehuetenango, Guatemala. The generic boundaries within the Gnaphalieae have been controversial and the genus Gnaphalio-thamnus has not been universally accepted. New molecular phylogenetic studies support the ac...
Similar publications
The new flavonoid gnaphaloside C, which was identified based on UV, MS, and NMR spectral data as spinacetin-7-O-(6″-O-caffeoyl)-β-D-glucopyranoside, and 24 known compounds including for the first time from this species quercetagetrin, quercetagetin-7-O-(6″-O-caffeoyl)glucoside, patulitrin, tinctoside, and spinacetin-7-O-glucoside were isolated from...
Citations
... Años más tarde, Hilliard y Burtt (1981) y Anderberg (1991) transfirieron diez, y aproximadamente 70 especies más de Gnaphalium a Pseudognaphalium, respectivamente. Recientemente se han realizado más cambios en otros Pseudognaphalium (Kartesz, 1999;Hinojosa-Espinosa y Villaseñor, 2014;Dillon y Luebert, 2015), y también se describió una nueva especie (Pruski, 2012). Una comparación completa entre Pseudognaphalium y Gnaphalium, así como la relación con otros géneros, se presenta en la publicación de Hinojosa-Espinosa y Villaseñor (2014). ...
Antecedentes y Objetivos:
Pseudognaphalium es un género de la tribu Gnaphalieae (Asteraceae) segregado de Gnaphalium. Desde su separación en 1950, ha habido una serie de transferencias que cubren todos los taxones mexicanos. McVaugh describe Gnaphalium vulcanicum var. monticola y, posteriormente, Espinosa-García G. oxyphyllum var. nataliae. Ambos nombres han tenido cambios nomenclaturales y, junto con las variedades típicas, se han mantenido como categorías infraespecíficas. El objetivo de este trabajo fue evaluar si existe soporte para reconocer como especies a cuatro variedades de Pseudognaphalium: P. liebmannii var. liebmannii, P. liebmannii var. monticola, P. oxyphyllum var. oxyphyllum y P. oxyphyllum var. nataliae.
Métodos:
Se realizó un análisis morfométrico de 77 muestras y la evaluación de 20 caracteres para encontrar la similitud entre cuatro categorías infraespecíficas: Pseudognaphalium liebmannii var. liebmannii, P. liebmannii var. monticola, P. oxyphyllum var. oxyphyllum y P. oxyphyllum var. nataliae.
Resultados clave:
El uso de análisis multivariados mostró que se pueden diferenciar objetivamente las cuatro variedades estudiadas. Éstas forman grupos aislados sin sobreposición entre sus elementos. Pseudognaphalium oxyphyllum var. nataliae está más cercano a P. oxyphyllum var. oxyphyllum y a su vez P. liebmannii var. monticola muestra mayor proximidad con P. oxyphyllum var. nataliae que con P. liebmanii var. liebmanii.
Conclusiones:
Como consecuencia de la separación de las categorías infraespecíficas estudiadas mediante el análisis de similitud se proponen como nuevas jerarquías taxonómicas a nivel de especie a Pseudognaphalium monticola y P. nataliae.
... Not only does the Mexican material not correspond to the morphology of M. santanica, the two populations would exhibit an amphitropical disjunction of over 6000 kms. The published results ofNie et al. (2013) andLuebert et al. (2017) both recover this taxon in a clade with Gnaphaliothamnus Kirp., far removed from Mniodes(Dillon & Luebert 2015).3. Mniodes turneri (Sagást. ...
Changes in the generic boundaries, as suggested by DNA sequence data, have altered concepts of Andean Asteraceae, specifically Belloa J. Rémy, Lucilia Cass., and Mniodes (A.Gray) Benth. (Gnaphalieae, Asteraceae). Over the past 30 years, numerous changes in classification and the resulting transfers have generated confusion. This paper provides a short history of these changes and current information for these genera as they exist in Andean South America. Further, other transfers are provided as suggested by results of sequence analysis data and newly proposed generic concepts: Belloa eriophora (J. Rémy) M. O. Dillon, comb. nov., and Belloa nivea (Phil.) M. O. Dillon, comb. nov. Changes in the diagnosis of Mniodes necessitates the following transfers: Mniodes argentea (Wedd.) M. O. Dillon, comb. nov., M. spathulifolia (Sagást. & M. O. Dillon) M. O. Dillon, comb. nov. and M. turneri (Sagást. & M. O. Dillon) M. O. Dillon, comb. nov.
... Chionolaena was treated by Freire (1993) as accepted by Anderberg (1991), where several species of Gnaphaliothamnus were synonymized under Chionolaena along with the monospecific genera Parachionolaena and Pseudoligandra (Dillon & Sagástegui Alva, 1990, 1991b. Dillon & Sagástegui Alva (1991b), Nesom (1990aNesom ( , b, 1994 and Dillon & Luebert (2015) treated Gnaphaliothamnus as a distinct genus composed of Mexican and Central American taxa. Nesom (2001) transferred the remaining Mexican and Central American species of Gnaphaliothamnus to Chionolaena, while maintain ing the opinion that the northern hemispheric elements were monophyletic. ...
... Moreover, there are a number of morphological characters separating them, as dis cussed above. These two genera should be considered separate taxonomic entities as suggested by Nesom (1990aNesom ( , 1994 and Dillon & Luebert (2015). The status of Parachionolaena and Pseudoligandra, also considered synonyms of Chionolaena (Freire, 1993), still needs to be assessed in the light of molecu lar data. ...
The Gnaphalieae (Asteraceae) are a cosmopolitan tribe with around 185 genera and 2000 species. The New World is one of the centers of diversity of the tribe with 24 genera and over 100 species, most of which form a clade called the Lucilia-group with 21 genera. However, the generic classification of the Lucilia-group has been controversial with no agreement on delimitation or circumscription of genera. Especially controversial has been the taxonomic value of achenial trichomes and molecular studies have shown equivocal results so far. The major aims of this paper are to provide a nearly complete phylogeny of the Lucilia-group at generic level and to discuss the evolutionary trends and taxonomic significance of achenial trichome morphology. We conducted a phylogenetic analysis of the New World Gnaphalieae with nrDNA (ETS, ITS) sequence data from a sampling of 18 genera of the Lucilia-group and utilized these results to examine morphological evolution of achenial trichome types and presence of apical myxogenic cells. Seven well-supported subclades can be recognized within the Lucilia-group (L1–L7). These results support Brazilian and Andean Berroa, Facelis, Lucilia, and Micropsis forming a clade (L1), the inclusion of Chilean Lucilia under Belloa (L2), the monophyly of Stuckertiella +Gamochaeta +Gamochaetopsis (L3), Chevreulia +Cuatrecasasiella (L4) and Antennaria (L5) excluding Antennaria linearifolia, which is resolved in a monophyletic group together with Jalcophila, Loricaria and Mniodes (L6), and the recognition of Gnaphaliothamnus (L7) removed from Brazilian taxa of Chionolaena (L2). Ancestral character state reconstruction of achenial trichome morphology suggests that clades are homogeneous in terms of trichome type, but with exceptions that make it highly homoplastic. Conversely, our results suggest that the presence of myxogenic apical cells is less homoplastic and that closely related species tend to resemble each other more than expected under random variation.
