Abstract: This paper reported a newly recorded genus of Poaceae in Guangdong, viz. Moliniopsis Hayata. This genus is monotypic with the type species, M. japonica (Hackel) Hayata, distributed in Russian Far East, Japan, South Korea and Southeast China (Anhui, Zhejiang, Jiangxi, Fujian). Recently, a population of this species was found in Conghua District, Guangzhou City, Guangdong Province, which is the southernmost population of this species. This new finding is of great significance for the future study of the geographical distribution and the origin and the spread of M. japonica. The vouchers are deposited in the herbarium of South China Botanical Garden, Chinese Academy of Sciences (IBSC).

Key words: Poaceae, new record; Moliniopsis japonica, Molinia

摘要： 报道广东禾本科一新记录属——沼原草属Moliniopsis Hayata。该属为单种属，模式种为沼原草M. japonica (Hack.) Hayata，分布于俄罗斯远东地区、日本、韩国以及中国东南部的安徽、浙江、江西、福建等省。最近该种的一个居群在广东省广州市从化区被发现，且是这个种分布最南的一个居群。该发现对于未来研究沼原草的地理分布和种群的起源与扩散具有重要意义。凭证标本保存在中国科学院华南植物园标本馆(IBSC)。

关键词: 禾本科, 新记录, 沼原草, 麦氏草属