Abstract: A alien plant species , Sysimbrium orientale L . (Brassicaceae ) is recorded in Yunnan , China in the paper . The species has been found invading the ecosystems of croplands and grasslands in Australia . Although it was previously recorded in China, there′s no alert report about it .Because the very small and mass-produced seed in siliques was dispersed by wind , the species can be potentially invasive . The result of our investigation indicated that there was a spreading trend of S. orientale in suburbs of Kunming, Central Yunnan . The biological characteristics and current status in Kunming were reported. We appealed to relevant government departments to make efforts to make a further investigation of its distribution and its invasion route . Assessment of its invasiveness in China is needed to eradicate it as early as possible to avoid its diffusion .

Key words: Sisymbrium orientale, Biological invasion

摘要： 报道了云南省一新记录的外来植物———西亚大蒜芥( Sisymbrium orientale L .)。该物种在澳大利亚入侵农田、草场, 在我国虽已有分布记录, 但未见到相关预警性研究报道, 目前为止尚未引起重视。西亚大蒜芥种子细小, 易随风传播, 具有形成大面积扩散的潜力。本次调查发现该物种在云南昆明有扩大分布的趋势。建议对该物种在我国的分布进行全面调查, 查清其分布状况和入侵途径, 并进行种群动态监测, 适时清除, 避免不必要的入侵发生。

关键词: 西亚大蒜芥, 生物入侵, 预警FONT