歸化的台灣禾草－－羽絨狼尾草的確認

Confirmation of a Naturalized Grass (Poaceae) in Taiwan, ＂Pennisetum setaceum＂ (Forssk.) Chiov

羽絨狼尾草在過去被報導為栽培植物，且容易被誤認為牧地狼尾草，近期透過重新檢視散置於台灣各主要標本館之狼尾草屬標本，確認兩物種間之差異及識別特徵。本文增補此種為歸化台灣之禾本科植物，並提供其物種描述、手繪圖，以及台灣狼尾草屬之檢索表供鑑定。

＂Pennisetum setaceum＂ was reported as a cultivated species from Taiwan in the past and is usually misidentified as ＂P. polystachion＂. Recently, we examined specimens in some herbaria of Taiwan and confirmed the differences and diagnostic characters of the two species. This article provides the key to species of the genus ＂Pennisetum＂ from Taiwan, and a description of this naturalized grass with line drawing for identification.