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Type: Article
Published: 2022-11-01
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Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, 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; 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
Hengduan Mountains region morphology taxonomy Thalictrum rostellatum Thalictrum tsawarungense Thalictrum wangii Eudicots

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.

References

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<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Yuan, Q. &amp; Yang, Q.E. (2018) Reinstatement of the independent specific status of <em>Thalictrum hamatum</em> (Ranunculaceae), with <em>T. macrorhynchum</em> reduced to its synonymy. <em>Phytotaxa</em> 369: 278‒286. https://doi.org/10.11646/phytotaxa.369.4.5</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Yuan, Q. &amp; Yang, Q.E. (2020a) <em>Thalictrum punduanum</em> var. <em>hirtellum</em> (Ranunculaceae), another new synonym of <em>T. neurocarpum</em>. <em>Phytotaxa</em> 442: 89‒100. https://doi.org/10.11646/phytotaxa.442.2.4</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Yuan, Q. &amp; Yang, Q.E. (2020b). <em>Thalictrum semiscandens</em> (Ranunculaceae), almost totally overlooked since its publication, is merged with <em>T. trichopus</em>. <em>Phytotaxa</em> 451: 283‒293. https://doi.org/10.11646/phytotaxa.451.4.3</span></span></span></p>
<p align="justify"><span style="color: #000000;"> <span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Yuan, Q. &amp; Yang, Q.E. (2020c) <em>Thalictrum mairei</em> (Ranunculaceae) is synonymous with <em>T. foliolosum</em>, not <em>T. leuconotum</em>. <em>Phytotaxa</em> 452: 137‒154. https://doi.org/10.11646/phytotaxa.452.2.3</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Yuan, Q. &amp; Yang, Q.E. (2021a) <em>Thalictrum nanhuaense</em> (Ranunculaceae), a new species from central Yunnan, China. <em>Phytotaxa </em>479: 121‒128. https://doi.org/10.11646/phytotaxa.479.1.10</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Yuan, Q. &amp; Yang, Q.E. (2021b) <em>Thalictrum brevisericeum</em> var. <em>pentagynum</em> (Ranunculaceae), a new synonym of <em>T. uncinulatum</em> from China. <em>Phytotaxa</em> 497: 97‒112. https://doi.org/10.11646/phytotaxa.497.2.3</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Yuan, Q. &amp; Yang, Q.E. (2021c) <em>Thalictrum kangdingense</em> (Ranunculaceae), a new synonym of <em>T. megalostigma</em> from China. <em>Phytotaxa</em> 498: 87‒103. https://doi.org/10.11646/phytotaxa.498.2.2</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Yuan, Q. &amp; Yang, Q.E. (2021d) <em>Thalictrum minshanicum</em> and <em>T. pseudoramosum</em> (Ranunculaceae), two new species from China. <em>Phytotaxa</em> 502: 133‒148. https://doi.org/10.11646/phytotaxa.502.2.2</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Yuan, Q. &amp; Yang, Q.E. (2021e) <em>Thalictrum jilongense</em> and <em>T. tenuicaule</em> (Ranunculaceae), described from China, are both merged with <em>T. leuconotum</em>. <em>Phytotaxa</em> 509: 168‒184. https://doi.org/10.11646/phytotaxa.509.2.2</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Yuan, Q. &amp; Yang, Q.E. (2021f) <em>Thalictrum bouffordii</em> (Ranunculaceae), a new species from the Qionglai mountains region in western Sichuan, China. <em>Phytotaxa</em> 510: 18‒28. https://doi.org/10.11646/phytotaxa.510.1.2</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Yuan, Q. &amp; Yang, Q.E. (2021g) Clarification of some imperfectly understood characters in the Chinese species <em>Thalictrum przewalskii</em> (Ranunculaceae), with reduction of <em>T. lasiogynum</em> and <em>T. latistylum</em> to its synonymy. <em>Phytotaxa</em> 511: 187‒210. https://doi.org/10.11646/phytotaxa.511.3.1</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Yuan, Q. &amp; Yang, Q.E. (2021h) <em>Thalictrum panzhihuaense</em> (Ranunculaceae) is placed in synonymy with <em>T. glandulosissimum</em>, with reduction of <em>T. tsaii</em> to <em>T. glandulosissimum</em> var. <em>tsaii</em>. <em>Phytotaxa</em> 520: 1‒20. https://doi.org/10.11646/phytotaxa.520.1.1</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Fei, W.Q., Yuan, Q. &amp; Yang, Q.E. (2021i) <em>Thalictrum changii</em> (Ranunculaceae), a new species from southern Xizang (Tibet), China. <em>Phytotaxa</em> 511: 248‒260. https://doi.org/10.11646/phytotaxa.511.3.4</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Yuan, Q. &amp; Yang, Q.E. (2022a). <em>Thalictrum spiristylum</em> (Ranunculaceae), described from northwestern Yunnan, China, is merged with <em>T. atriplex</em>. <em>Phytotaxa</em> 538: 1‒20. https://doi.org/10.11646/phytotaxa.538.1.1</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Yuan, Q. &amp; Yang, Q.E. (2022b). <em>Thalictrum daguanense</em> (Ranunculaceae) is merged with <em>T. omeiense</em>, a species distributed in Sichuan and Yunnan, China. <em>Phytotaxa</em> 539: 130‒146. https://doi.org/10.11646/phytotaxa.539.2.2</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Yuan, Q. &amp; Yang, Q.E. (2022c). <em>Thalictrum fusiforme</em> (Ranunculaceae), described from southeastern Xizang (Tibet), China, is merged with <em>T. rostellatum</em>, a Sino-Himalayan species. <em>Phytotaxa</em> 545: 234‒260. https://doi.org/10.11646/phytotaxa.545.3.1</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Yuan, Q. &amp; Yang, Q.E. (2022d) Lectotypification of <em>Thalictrum chayuense </em>(Ranunculaceae), with its reduction to the synonymy of <em>T. tsawarungense</em>, both described from Zayu in southeastern Xizang, China. <em>Phytotaxa</em> 548: 184‒198. https://doi.org/10.11646/phytotaxa.548.2.4</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Yuan, Q. &amp; Yang, Q.E. (2022e) <em>Thalictrum cuonaense</em> (Ranunculaceae) is merged with the Himalayan <em>T. reniforme</em>, with notes on its morphologically similar species. <em>Phytotaxa</em> 554: 221‒244. https://doi.org/10.11646/phytotaxa.554.3.2</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Zeng, Y.P., Yuan, Q. &amp; Yang, Q.E. (2022f) Clarification of morphology and distribution of <em>Thalictrum fortunei</em> (Ranunculaceae) from China, with reduction of <em>T. fortunei </em>var. <em>bulbiliferum</em> to its synonymy on its morphologically similar species. <em>Phytotaxa</em> 561: 121‒137. https://doi.org/10.11646/phytotaxa.561.2.1</span></span></span></p>