A synopsis of Jarava Ruiz & Pav. and Nassella E. Desv. (Stipa L. s.l.) (Poaceae: Stipeae) in southwestern Europe
2005; Volume: 60; Issue: 1 Linguagem: Inglês
ISSN
2235-3658
Autores Tópico(s)Botany and Plant Ecology Studies
ResumoVERLOOVE, F. (2005). A synopsis of Jarava Ruiz & Pav. and Nassella (Trin.) E. Desv. (Stipa L. s.l.) (Poaceae : Stipeae) in southwestern Europe. Candollea 60 : 97-117. In English, English and French abstracts. A taxonomic revision of the naturalized representatives of the South American genera Jarava Ruiz & Pav. and Nassella (Trin.) E. Desv. (segregates of Stipa L. s.l.) in Europe revealed several interesting data. Eight taxa are currently regarded as, at least locally, naturalized in the Iberian Peninsula, Macaronesia, France (incl. Corsica) and/or Italy: Jarava ambigua (Speg.) Penail., J. brachychaeta (Godr.) Penail., J. caudata (Trin.) Penail. and J. plumosa (Spreng.) S. W. L. Jacobs & J. Everett, and Nassella neesiana (Trin. & Rupr.) Barkworth, N. poeppigiana (Trin. & Rupr.) Barkworth, N. tenuissima (Trin.) Barkworth and N. trichotoma (Nees) Arechav. Nassella mucronata (Kunth) R. W. Pohl has not been confirmed, all actual European populations being definitely ascribable to the closely related N. neesiana. Particular attention is paid to the confusion of both taxa in Europe and useful diacritic features for their distinction are discussed. Only two taxa have become more or less widespread to date (N. neesiana and N. trichotoma), both being present respectively in all or nearly all investigated countries. Two further taxa (Jarava brachychaeta and J. caudata) also tend to increase. Jarava ambigua (confused with J. brachychaeta in S-France) is cited for the first time as a naturalized alien in Europe. All taxa but Nassella tenuissima (which is an escape from cultivation) are believed to have been introduced unintentionally ; all are of American origin. Each taxon is described and a dichotomous key, original line drawings of all species’ anthecia and further chorological, nomenclatural, taxonomic and ecological data are provided. RESUME VERLOOVE, F. (2005). Synopsis des genres Jarava Ruiz & Pav. et Nassella (Trin.) E. Desv. (Stipa L. s.l.) (Poaceae : Stipeae) dans le sud-ouest de l’Europe. Candollea 60 : 97-117. En anglais, resumes anglais et francais. Une revision taxonomique des especes naturalisees en Europe des genres sud-americains Jarava Ruiz & Pav. et Nassella (Trin.) E. Desv. (Stipa L. s.l.) a fourni des resultats interessants. Actuellement, huit taxons sont consideres comme naturalises, au moins localement, dans la peninsule Iberique, en Macaronesie, en France (incl. la Corse) et/ou en Italie: Jarava ambigua (Speg.) Penail., J. brachychaeta (Godr.) Penail., J. caudata (Trin.) Penail. et J. plumosa (Spreng.) S. W. L. Jacobs & J. Everett et Nassella neesiana (Trin. & Rupr.) Barkworth, N. poeppigiana (Trin. & Rupr.) Barkworth, N. tenuissima (Trin.) Barkworth et N. trichotoma (Nees) Arechav. Nassella mucronata (Kunth) R. W. Pohl n’est pas retenu ; toutes les donnees europeennes appartenant en definitive a l’espece voisine N. neesiana. Une attention particuliere est accordee a la distinction entre ces deux taxons souvent confondus et leurs caracteres differentiels sont discutes. Deux taxons seulement se
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