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Issue: Vol. 572 No. 1: 8 November 2022
Type: Article
Published: 2022-11-08
DOI: 10.11646/phytotaxa.572.1.2
Page range: 25-42
Abstract views: 28
PDF downloaded: 3

Raising Thalictrum uncatum var. angustialatum (Ranunculaceae) from China to T. angustialatum as an independent species based on evidence from morphology, geographical distribution, cytology and molecular systematics

Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China; Center of Conservation Biology, Core Botanical Gardens, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China; University of Chinese Academy of Sciences, Beijing 100049, China
Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China; Center of Conservation Biology, Core Botanical Gardens, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China
Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China; Center of Conservation Biology, Core Botanical Gardens, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China
chromosome number molecular phylogeny new combination new status taxonomy Eudicots

Abstract

Critical observations on living plants in the wild revealed remarkable differences in floral and achene characters between Thalictrum uncatum var. angustialatum (Ranunculaceae) and its type variety, T. uncatum var. uncatum, both from China. Their geographical distributions are basically independent, only slightly overlapping in western Sichuan and northwestern Yunnan. Moreover, T. uncatum var. angustialatum was found to be a tetraploid with the chromosome number of 2n = 4x = 28, whereas T. uncatum var. uncatum a diploid with 2n = 2x = 14. Furthermore, molecular phylogenetic analyses indicated that T. uncatum var. angustialatum was more closely related to T. sinomacrostigma, also a tetraploid, than to T. uncatum var. uncatum. Evidence from morphology, geographical distribution, cytology and molecular systematics, therefore, all indicates that T. uncatum var. angustialatum may better be raised to the specific rank as an independent species of its own, i.e. T. angustialatum. A full description is provided for T. angustialatum.

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