Thalictrum bouffordii (Ranunculaceae), a new species from the Qionglai mountains region in western Sichuan, China Author Zeng, You-Pai 0000-0003-3259-8011 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 & zengyoupai @ scbg. ac. cn; https: // orcid. org / 0000 - 0003 - 3259 - 8011 zengyoupai@scbg.ac.cn Author Yuan, Qiong 0000-0003-2613-5045 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 & yuanqiong @ scib. ac. cn; https: // orcid. org / 0000 - 0003 - 2613 - 5045 yuanqiong@scib.ac.cn Author Yang, Qin-Er 0000-0002-6261-0731 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 & qeyang @ scib. ac. cn; https: // orcid. org / 0000 - 0002 - 6261 - 0731 qeyang@scib.ac.cn text Phytotaxa 2021 2021-07-01 510 1 18 28 http://dx.doi.org/10.11646/phytotaxa.510.1.2 journal article 4400 10.11646/phytotaxa.510.1.2 01c940a7-0d58-4fec-9474-8f4d8dff5543 1179-3163 5426244 Key to Thalictrum bouffordii and its closely similar species 1a. Stamens 6‒7 mm long; achenes pubescent ........................................................................................................................................2 1b. Stamens 3‒5 mm long; achenes glabrous...........................................................................................................................................3 2a. Sepals pubescent abaxially; filaments purplish................................................................................................................ T. bouffordii 2b. Sepals glabrous; filaments white ................................................................................................................................... T. xinningense 3a. Inflorescence a thyrse; stamens 14‒20............................................................................................................................. T. nepalense 3b. Inflorescence dichotomous and corymbiform; stamens 40‒60 ....................................................................................... T. javanicum