本文描述一臺灣新歸化蕁麻科植物－歐蕁麻（Urticaurens L.）。根據國外的諸多研究及文獻，歐蕁麻具有潛在入侵性，建議長期監測其擴散情形，若有植株出現應立即剷除為宜。本文提供歐蕁麻的特徵描述、照片、分布圖及其與臺灣蕁麻屬植物之檢索表，以供鑑定參考。

This article presents a newly naturalized plant of Urticaceae in Taiwan-Urtica urens L. Previous reports have highlighted the potential of U. urens to become an invasive species. Therefore, it is advised to conduct both short-term and long-term monitoring of its spread and take prompt measures to remove any occurrences. To aid in identification, this report offers a detailed description, color photographs, and a distribution map of U. urens. Additionally, a key to the species of Urtica in Taiwan is provided for further reference.