巴西秋海棠（秋海棠科短生組），臺灣新歸化種

本研究報導臺灣的一新歸化種－巴西秋海棠。本種經常作為觀賞植物栽培，由於其種子細小，因此容易逸出，加上良好的適應能力，使其於印度、夏威夷及北美洲都有歸化紀錄。本種能夠產生大量的子代，在野外的更新良好，目前已於臺灣北部及中部發現歸化族群，多生長於路旁或為溫室內的雜草。此外，筆者更發現本種與臺灣原生的秋海棠共域生長，未來有可能形成兩者的天然雜交後代。因此本種於野外的生長狀況，實有必要加以監控並移除。文中並比較本種與另一同組且已作為園藝作物引進的近似種四季秋海棠的形態差異，提供鑑定之需求。

We report a newly naturalized Begonia hirtella Link of Taiwan in this article. This species was a famous ornamental plant that had been introduced to many countries and naturalized in India, Hawaii and United States. In Taiwan, B. hirtella was found in the wild at low altitudes of central and northern parts of the island, on the roadsides or in the greenhouses. This species would becoming a high potential invasive species due to its well regeneration ability in the wild, and the possibility of hybriding with native species. The morphological comparison of B. hirtella with B. cucullata was also provided in this article for identification.