臺灣新歸化植物：古錢冷水花（蕁麻科）

A Newly Naturalized Species in Taiwan: Pilea nummulariifolia (Swartz) Weddell (Urticaceae)

本文記錄一引進臺灣作為園藝作物的歸化現狀。古錢冷水花（Pilea nummulariifolia(Swartz) Weddell）為原產熱帶美洲之蕁麻科植物，目前全島皆有種植情形，引進年份不詳。本文依照國際對於歸化植物之定義，檢視該物種在標本採集地點之分布及生長狀況，完全未經由人為協助而自立繁殖、開花結果，進而判定其為新歸化之物種。古錢冷水花（Pilea nummulariifolia）以具圓齒的圓形葉和密生毛的長匍伏莖，與其他同屬植物可以區分。本文提供形態描述、生育地描述及手繪圖作為鑑定之用。

This report is regarding the naturalization status of an introduced ornamental species, Pilea nummulariifolia (Swartz) Weddell. Pilea nummulariifolia, a member of Urticaceae, is originated from tropical America, and has been widely cultivated through out the island of Taiwan. This species can be identified by its rounded leaves with toothed edges and long ascending or procumbent stem with densely hairs. This paper describes this newly naturalized species and provides line drawing and photograph for identification.