Abstract

Geranium pusillum L., an annual or biennial herb mainly native to Europe, northern Africa, and western Asia, has recently become naturalized in mountain regions of central Taiwan at about 1,800-2,300 m in elevation. This species is very similar to G. molle, which was also recently found to have become naturalized in Taiwan; however, the former has smaller flowers and scabrous fruits. In the present work, we provide a taxonomic description, an illustration, photographs, and scanning electron micrographs to facilitate identification. Furthermore, a key to the taxa of the genus Geranium in Taiwan is also provided.

中文摘要

主要原產於歐洲、北非、西亞的牻牛兒苗科植物－小花牻牛兒苗（Geranium pusillum L.），新歸化於台灣中部山區，為一年或二年生草本。小花牻牛兒苗與最近歸化於臺灣山區的柔毛牻牛兒苗形態相似，但是花較小，且果實表面粗糙具短毛而可區分。本文提供分類特徵描述，手繪圖，照片與檢索表以供區分鑑定。

Keyword: Geraniaceae, Geranium pusillum, naturalized plant, Taiwan, taxonomy, 牻牛兒苗科, 小花牻牛兒苗, 歸化植物, 臺灣, 分類