臺灣兩種新歸化水丁香屬（柳葉菜科）植物

Two newly naturalized Ludwigia spp. (Onagraceae) to the flora of Taiwan

本文描述二種臺灣新歸化柳葉菜科水丁香屬植物：烏拉圭水丁香(Ludwigia hexapetala (Hook. & Arn.) Zardini, H.Y. Gu & P.H. Raven)與祕魯水丁香(L. peruviana (L.) H. Hara)，並提供它們的模式影像資訊、彩色照片與臺灣產本屬成員檢索表以利鑑定。由於部分臺灣產本屬植物的形態特徵具有鑑識價值，因此一併描述並提供相關圖片，並提供水丁香(L. octovalvis (Jacq.) Raven)此一物種的相關補註。

Two newly naturalized primrose-willow (Onagraceae): Ludwigia hexapetala (Hook. & Arn.) Zardini, H.Y. Gu & P.H. Raven and L. peruviana (L.) H. Hara were described herein. Type images‘information, color photos of these two species, and a brief key to Taiwanese Ludwigia spp. were offered benefit for identification. Based on their determination values, photos and their descriptions of several Taiwanese relative congeneric species were offered, as well as a brief note about L. octovalvis (Jacq.) Raven was also provided.