镰花黄堇在中国的分布确认及其系统发育位置解析

Confirmation of the distribution of Corydalis drepanantha in China and analysis of its phylogenetic placement

关键词:  紫堇属, 皱波黄堇组, 西藏, 新记录, 系统发育

Key words:  Corydalis, Corydalis sect. Radicosae, Xizang, new record, phylogeny

摘要:

紫堇属(Corydalis DC.)是罂粟科第一大属,中国西南地区是该属的多样性中心之一。为进一步阐明紫堇属植物在西藏的物种多样性与地理分布,该文通过野外调查、文献查阅、馆藏标本研究及系统发育分析,首次确认了镰花黄堇(C. drepanantha D. G. Long)在中国的分布记录,并对其形态特征及系统发育位置进行了研究。结果表明:(1)镰花黄堇时隔90年再次在中国境内被发现,确认了该种在中国的自然分布。(2)系统发育分析支持镰花黄堇隶属于皱波黄堇组[C. sect. Radicosae(Lidén)Lidén],并表明其与展枝黄堇(C. diffusa Lidén)的亲缘关系较近。(3)在形态上,镰花黄堇可通过内花瓣先端淡黄色、叶片末回裂片披针形及果期苞片通常长于果梗等特征与近缘种明确区分。该文进一步丰富了中国紫堇属植物的物种多样性资料,为后续开展该属的分类学、系统发育与生物地理学研究奠定了基础。

Abstract:

Corydalis DC. is the largest genus in Papaveraceae, and southwest China is recognized as one of major centers of diversity for the genus. To further clarify the species diversity and geographical distribution of Corydalis in Xizang, this study integrated field surveys, literature reviews, herbarium specimen examinations, and phylogenetic analysis. The occurrence of C. drepanantha D. G. Long in China was confirmed for the first time, and its morphological characteristics and phylogenetic placement were investigated. The main results are as follows:(1)The rediscovery of C. drepanantha in China after nearly 90 years confirms its natural distribution within the country.(2)Phylogenetic analysis supports the placement of C. drepanantha within C. sect. Radicosae(Lidén)Lidén, and indicates that it is closely related to C. diffusa Lidén.(3)Morphologically, C. drepanantha can be clearly distinguished from its closely related species by the pale yellow apices of the inner petals, lanceolate ultimate leaf segments, and fruiting bracts that are usually longer than the pedicels. This study further enriches the data on the species diversity of the genus Corydalis in China, and provides a foundation for future taxonomic, phylogenetic, and biogeographic studies of the genus.