Asarum yaeyamense Hatusima (Aristolochiaceae) Newly Found in Northern Taiwan

台灣北部新紀錄植物－八重山細辛

呂長澤(Chang-Tse Lu) ； 陳建文(Chien-Wen Chen) ； 王震哲(Jenn-Che Wang)

《台灣林業科學》 24卷3期 (2009/09) Pp. 149-157

https://doi.org/10.7075/TJFS.200909.0149

摘要

八重山細辛為細辛屬杜蘅組植物之一員，根據以往的紀錄僅知分布於琉球群島的西表島，為當地之特有種。最近，我們發現其亦分布於台灣北部。此物種與分布於台灣中部的下花細辛及分布於琉球群島奄美大島的藤野細辛十分相似。但是，可由較小的花及萼裂片基部皺摺狀突起較少與前者區別，並可以由紫色帶有綠色的花與後者區分。本文除描述形態特徵、手繪圖及彩色照片外，並提供台灣產該種植物之染色體數目(2n=24)及花粉形態。另外，並討論此物種與其在台灣及琉球的近緣種之間的關係。

關鍵字

細辛屬 ； 八重山細辛 ； 杜蘅 ； 新紀錄 ； 台灣

並列摘要

Asarum yaeyamense Hatusima, a member of the section Heterotropa, was formerly reported as an endemic species distributed on Iriomote Island, southern Ryukyus of Japan. During our botanical surveys, this species was newly found in northern Taiwan, representing a new record to the flora of Taiwan. The species is closely related to A. hypogynum Hayata in central Taiwan and A. fudsinoi T. Ito on Amami Island, the northern Ryukyus. However, it can be distinguished from the former by a smaller flower and less-raised rugosity at the base of the calyx-lobes, and from the latter by the greenish-purple flower. In addition to a taxonomic description, line drawings, and color photos, the chromosome number (2n=24) and pollen morphology of the Taiwanese materials are also provided. Moreover, the relationship of this species with its close allies in Taiwan and the Ryukyus is discussed.

並列關鍵字

Asarum ； Asarum yaeyamense ； Heterotropa ； new record ； Taiwan