台灣新歸化禾本科植物──鈎毛草

Pseudechinolaena polystachya (Kunth) Stapf--A newly naturalized Poaceae in Taiwan

鈎毛草（Pseudechinolaena polystachya（Kunth）Stapf）原產中南美洲、非洲和亞洲的熱帶山地林下。本種為小草本，小穗成熟時內穎表面密生開展的鈎狀剛毛的特徵與台灣原生的其他種類明顯不同。本文報導鈎毛草歸化於台灣中部低海拔地區的果園道路邊緣和荒廢地，描述其外部形態特性，生育地環境和共同伴生之植物。

Pseudechinolaena polystachya (Kunth) Stapf, belonging to the grass family, is widely distributed in America, Africa and Asia. This species is characterized by its upper glume of spikelet densively covered with long hooked-hair in fruiting stage. In a recent plant survey, we found a wild naturalized population of Pseudechinolaena polystachya in Central Taiwan. A detailed description with color photographs, linedrawing and habitat information is provided in this paper.