臺灣新歸化菊科植物：沼生金鈕扣

Acmella uliginosa (Swartz) Cassini (Asteraceae): A Newly Naturalized Plant in Taiwan

沼生金鈕扣（Acmella uliginosa(Swartz) Cassini）（菊科）非臺灣原生種，近來在台北地區發現其野生族群，為臺灣新歸化植物。本篇報告描述其形態特徵、地理分布、生育環境及物候特性，並提供彩色圖片及繪圖，同時製作檢索表區別其在臺灣同屬之金鈕扣（A. paniculata(Wall. ex DC.) R. K. Jansen）及已引進栽植之印度金鈕扣（A. oleracea(L.) R. K. Jansan）。

This paper describes Acmella uliginosa (Swartz) Cassini (Asteraceae), a plant newly naturalized in Taiwan. It has established its feral population in Taipei, and is closely related to the formerly introduced cultivated species A. oleracea (L.) R. K. Jansan and the indigenous species A. paniculata (Wall. ex DC.) R. K. Jansen of Taiwan. However, the three species are distinguishable by the conformations of leaves, heads and achenes. In addition to its description and distribution, a colorful photograph, a line drawing illustration and a simplified key to the three species addressed above are also provided in this article.