記臺灣兩種新歸化植物——短梗土丁桂（旋花科）與南美鐵莧（大戟科）

Notes on Two Newly Naturalized Plants in Taiwan: Evolvulus nummularius (L.) L. (Convolvulaceae) and Acalypha aristata Kunth (Euphorbiaceae)

短梗土丁桂（Evolvulus nummularius(L.) L.）及南美鐵莧（Acalypha aristata Kunth）（新擬中名）為新歸化於臺灣之旋花科與大戟科植物。本文描述這兩種植物，除提供形態、解剖圖幅外，並報告其分佈、生態及與相近種之差異。

Evolvulus nummularius (L.) L. and Acalypha aristata Kunth, originally native to tropical America, were recently found naturalized in disturbed sites of Taiwan. The present study gives the taxonomic description and line drawings of the two species. In addition, their distributions and notes on ecology are provided.