Studies within the genus Digitaria Haller (Poaceae, Panicoideae) in southwestern Europe

摘要

Herbarium revisions and recent fieldwork in France and Italyyielded several interesting new data about the grass genus Dig-'taria Haller (Poaceae, Panicoideae). The historical presenceof Digitaria debilis (Desf.) Willd. in continental France.is finallyconfirmed. Digitaria radicosa (C. Presl) Miq. is reported for thefirst time from Europe (ephemeral alien in Corse) and Digitariaviolascens Link is an overlooked, recently naturalized xeno-phyte in France and Italy. Diagnostic characteristics of Digitariaischaemum (Schweigg.) Muhl. and Digitaria violascens arediscussed. Drawings and an identification key for the species ofDigitaria in southwestern Europe are provided.