Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, China

YOU-PAI ZENG; QIONG YUAN; QIN-ER YANG

doi:10.11646/phytotaxa.571.1.1

Issue: Vol. 571 No. 1: 1 November 2022

Type: Article

Published: 2022-11-01

DOI: 10.11646/phytotaxa.571.1.1

Page range: 1-20

Abstract views: 41

PDF downloaded: 5

Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, China

YOU-PAI ZENG⁺⁻
QIONG YUAN⁺⁻
QIN-ER YANG⁺⁻

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

Hengduan Mountains region morphology taxonomy Thalictrum rostellatum Thalictrum tsawarungense Thalictrum wangii Eudicots

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Abstract

Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from the southern Hengduan Mountains region in southeastern Xizang and northwestern Yunnan, China, are illustrated and described. Morphologically T. hengduanshanense is most closely similar to T. tsawarungense in having narrowly oblanceolate-linear filaments of stamens and apically slightly recurved styles, but differs by having laxly branched, corymb-like (vs. narrowly paniculiform) inflorescences and larger (ca. 9 mm vs. 4.5‒7 mm long), narrowly lunate (vs. broadly lunate) achenes (body width/body length = ca. 1/3 vs. ca. 1/2). Thalictrum longistipitatum is closely similar to T. hengduanshanense in habit and in having narrowly oblanceolate-linear filaments of stamens, apically slightly recurved styles, and long stipitate achenes, but differs by having apically abruptly recurved (vs. straight) pedicels and shorter styles (ca. 1 mm vs. ca. 2 mm long). Chromosome numbers of T. longistipitatum (2n = 14), T. rostellatum (2n = 28), T. tsawarungense (2n = 14) and T. wangii (2n = 14) are reported here for the first time.

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