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Hàbitat, hàbit i detalls d'Euphorbia virgata a Catalunya: (A), Guissona, en el seu hàbitat; (B), Falset, fragment de la inflorescència; (C), Falset, fulles; (D), Cornudella, fulles; (E), Cornudella, hàbit i fulles.
Source publication
The recent discovery in the north-east of the Iberian Peninsula (southern and central Catalonia) of three populations belonging to the Euphorbia esula–E. virgata complex (Euphorbiaceae) prompted us to conduct a macro- and micromorphological study to ascertain their taxonomic identity. Only two previous records of plants from this complex existed in...
Context in source publication
Context 1
... hàbitats més aviat secs, temporalment poc estables i més o menys antropitzats d'E. virgata (Fig. 3) contrasten amb els típics d'E. esula, una planta que en general està associada a comunitats herbàcies permanents de llocs humits. Geltman (1998) indica que a la regió bàltica E. esula creix sobretot en llocs humits i poc alterats pròxims al litoral, mentre que en regions més meridionals de l'Europa oriental es fa en planes d'inundació ...
Citations
... Aquesta planta de taxonomia conflictiva ha estat citada en temps recents de tres localitats del Priorat i la Segarra, i se'n coneixen dues recoŀleccions antigues a l'Alt Empordà i al Segrià (Molero et al., 2012;com a E. virgata Waldst. & Kit.). ...
Notes on alien flora in Catalonia. IV This work provides data on very rare alien plants in Catalonia and also new locations of geographical interest about not so rare species. 8 taxa (Aloiampelos striatula, Aurinia saxatilis, Cotoneaster ×suecicus, Dianthus plumarius, Forsythia viridissima, Oenothera villosa subsp. villosa, Phyllostachys sulphurea and Rosa banksiae) are new to the Iberian flora and 3 to the Catalan flora (Argyranthemum frutes-cens, Leucanthemum ×superbum, Opuntia bonaerensis). The naturalization in the territory of Cotoneaster perpusillus is also confirmed. Additionally, we confirm that Erigeron karvinskianus is becoming in recent years a conflicting invasive plant on the Montserrat mountain , where it competes with the native flora of the cliffs.
... E.-L. Swann (P 759695); Surrey: field by new by-pass between Dorking and Leatherhead, 6.1935, N. Y. Sandwith 812 (G).vonMolero & al. (2012) als E. virgata bezeichneten Populationen in Katalonien gehören nach den gezeigten Bildern zu E. saratoi. Die Pflanze wurde hier erstmals 1908/1909 als E. esula subsp. ...
Euphorbia saratoi (= E. podperae, E. pseudovirgata auct., E. virgata var. orientalis, E. virgultosa) a successful neophyte of unknown origin in Central Europe and North America. An Euphorbia species, which reached Central Europe and North America in the 19th century was first regarded as E. esula or E. virgata. At the middle of the 20th century it was mostly regarded as a hybrid between E. esula and E. virgata for which the name E. ×pseudovirgata was used. Later, the taxon has been classified as E. pseudovirgata by various authors.
E. pseudovirgata (= E. virgata var. pseudovirgata) is synonymous to E. virgata. The oldest name for the taxon is E. saratoi with E. virgata var. orientalis, E. esula f. linariifolia, E. podperae and E. virgultosa as synonyms.
According to chromosome counts from Germany E. saratoi has 2n = 60 as E. esula, clearly different from E. virgata with 2n = 20. Leaves of E. saratoi and E. virgata have (mostly unequal) layers of palisade parenchyma at the upper and lower side and an amphistomatic stomata distribution; E. esula has only one layer of palisade parenchyma. The leaves are predominantly hypostomatic. Palisade parenchyma consists of one cell row in E. saratoi and two cell rows in E. virgata. The form of the leaves is variable but generally leaves of E. saratoi have parallel sides over most of its length, leaves of E. esula have the greatest width at the distant third. In E. virgata leaves show the greatest width at the proximal third. Cyathia of E. esula have lines of hairs at the inner side, missing at E. saratoi and E. virgata. The leaf like structures within the cyathia (septal scales, bracts) are hairy for most of their length in E. esula while hairs are only found at the tips in E. saratoi and E. virgata.
E. saratoi is certainly neophytic in parts of Europe and North America. So far, the original distribution range cannot be depicted with certainty.
Euphorbia L. (Euphorbiaceae), one of the largest genera of angiosperms, is represented in the Caucasus by 80 species. This paper contains a taxonomic treatment for these species and a key for their determination. For every species the following information is provided: accepted name and major synonyms with typification where possible; brief characteristics of habitats; distribution in the Caucasus and indication of geographical element (for indigenous species); and taxonomic and geographical notes if necessary. Lectotypes of Euphorbia arvalis Boiss. et Heldr., E. damascena Boiss., E. fossulata Boiss. et Gaill., E. iberica Boiss. var. intermedia Boiss., E. kemulariae Ter-Chatsch., E. notadenia Boiss. et Hohen., E. platyphyllos L., E. paralias L. and E. ruderalis Sheele are newly designated. The indigenous component of Caucasian Euphorbia comprises 73 species. The majority belong to three geographical elements: Euro-Siberian (41.10%), Irano-Turanian (20.54%) and Submediterranean (15.07%). There are also 7 alien species mostly of North American origin. Taxonomically, most of Caucasian Euphorbia species (70 or 87.5%) belong to subgen. Esula and represent 16 of the 21 currently accepted sections. The remaining ten species belong to subgen. Chamaesyce.
