Abstract

A new record of a naturalized plant of Asteraceae, Eleutheranthera ruderalis (Swartz) Sch.-Bip. was found in southern Taiwan. Eleutheranthera Poit. ex Bosc is also a new genus to the Flora of Taiwan. E. ruderalis can be easily distinguished from Synedrella nodiflora (L.) Gaertn. by its head only with disc florets, stamens free, pappus absent, achenes pubescent and angled. A taxonomic description, line drawing, photographs, and a map showing its distribution on this island are provided.

中文摘要

本文報導臺灣南部新歸化菊科植物－離藥金腰箭 (Eleutheranthera ruderalis (Swartz) Sch.-Bip.)，離藥金腰箭屬 (Eleutheranthera Poit. ex Bosc) 同時也是臺灣的新紀錄屬。本種於1996年初次採集於南臺灣，雖與金腰箭 (Synedrella nodiflora (L.) Gaertn.) 很相似，但由本種頭狀花序僅具管狀花、雄蕊分離、無冠毛、瘦果有毛且具稜角可加以區別。本文提供該種植物的分類性狀描述、手繪圖和在臺灣的分布圖。

Keyword: Asteraceae, Eleutheranthera ruderalis, Naturalized, Taiwan, Taxonomy. 菊科、離藥金腰箭、歸化、臺灣、分類學。