台灣柳葉菜科的新歸化植物──美麗月見草

Oenothera speciosa Nutt. (Onagraceae), a newly naturalized species in Taiwan

月見草屬植物為柳葉菜科的一個屬，台灣已記載有7種。本研究報導最近發現歸化於台灣東北部地區的美麗月見草（Oenothera speciosa Nutt.）。此植物可能為栽培逸出的野花，文除提供其分類特徵描述、彩色照片、花粉粒之掃瞄式電子顯微鏡照片以及生態分布外，並提出台灣產本屬植物分種之檢索表，以利本屬植物之辨識。

Seven species of the genus Oenothera (Onagraceae) have been recorded in Taiwan. This paper is a report on Oenothera speciosa Nutt., a newly naturalized wild flower that may have escaped from cultivation, and is now found in northeastern Taiwan. Description, photographs, SEM photographs of pollen grains and the species' ecological distribution are described. A key to the species of Oenothera of Taiwan is also provided to aid identification.