Abstract
Based on critical observations on herbarium specimens (including type material) and living plants in the wild, we demonstrate that the holotype itself and the type collection of Thalictrum chayuense, which was described from Zayu county in southeastern Xizang (Tibet), China, are mixed, consisting of two taxa, T. chayuense and T. nepalense. Lectotypification is proposed for T. chayuense herein. Thalictrum chayuense is then determined to be conspecific with T. tsawarungense, a species described also from Zayu in southeastern Xizang. We therefore reduce T. chayuense to the synonymy of T. tsawarungense.
References
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<p>Wang, W.T. & Wang, S.H. (1979b) <em>Thalictrum</em> L. <em>In</em>: Anonymous (Ed.) <em>Flora Reipublicae Popularis Sinicae</em>, vol. 27. Science Press, Beijing, pp. 502–592.</p>
<p>Wu, C.Y. (1984) <em>Index Florae Yunnanensis</em>, vol. 1. Yunnan People’s Publishing House, Kunming, 1070 pp.</p>
<p>Wu, Y.H. (2008) <em>The Vascular Plants and Their Eco-Geographical Distribution of the Qinghai-Tibetan Plateau</em>. Science Press, Beijing, 1369 pp.</p>
<p>Yonekura, K. (2008) Ranunculaceae. <em>In</em>: Ohba, H., Iokawa, Y. & Sharma, L.R. (Eds.) <em>Flora of Mustang, Nepal</em>. Kodansha Scientific Ltd., Tokyo, pp. 61‒94.</p>
<p>Zeng, Y.P., Yuan, Q. & Yang, Q.E. (2021) <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</p>
<p>Zeng, Y.P., Yuan, Q. & Yang, Q.E. (2022) <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</p>
<p>Finet, A.E. & Gagnepain, F. (1903) Contributions a la flore de l’Asie orientale d’aprés l’herbier du muséum de Paris. <em>Bulletin de la Société Botanique de France</em> 50: 600–625. https://doi.org/10.1080/00378941.1903.10831058</p>
<p>Franchet, A. (1889‒1890) <em>Plantae Delavayanae</em>. Paul Klincksieck, Paris, 240 pp. https://doi.org/10.5962/bhl.title.10529</p>
<p>Fu, D.Z. & Zhu, G.H. (2001) <em>Thalictrum</em> Linnaeus. <em>In</em>: Wu, Z.Y., Raven, P.H. & Hong, D.Y. (Eds.) <em>Flora of China</em>, vol. 6. Science Press, Beijing & Missouri Botanical Garden Press, St. Louis, pp. 282–302.</p>
<p>Grierson, A.J.C. (1984) Ranunculaceae. <em>In</em>: Grierson, A.J.C. & Long, D.G. (Eds.) <em>Flora of Bhutan</em>, vol. 1, part 2. Royal Botanical Garden, Edinburgh, London, pp. 283−321.</p>
<p>Hara, H. (1979) Ranunculaceae. <em>In</em>: Hara, H. & Williams, L.H.J. (Eds.) <em>An Enumeration of the Flowering Plants of Nepal</em>, vol. 2. British Museum (Natural History), London, pp. 9–23.</p>
<p>Hooker, J.D. & Thomson, T. (1855) Ranunculaceae. <em>In</em>: Hooker, J.D. & Thomson, T. (Eds.) <em>Flora Indica</em>, vol. 1. W. Pamplin, London, pp. 1–60.</p>
<p>Lecoyer, J.C. (1885) Monographie du genre <em>Thalictrum</em>. <em>Bulletin de la Société Royale de Botanique de Belgique</em> 24: 78–324.</p>
<p>Li, H. & Li, R. (2020) <em>Plant Resources and Geography of the Gaoligong Mountains in Southeast Tibet</em>. Hubei Science and Technology Press, Wuhan, 1288 pp.</p>
<p>Linnaeus, C. (1753) <em>Species Plantarum</em>. Laurentii Salvii, Holmiae, 1200 pp.</p>
<p>McNeill, J. (2014) Holotype specimens and type citations: General issues. <em>Taxon</em> 63: 1112−1113. https://doi.org/10.12705/635.7</p>
<p>Rau, M.A. (1993) Ranunculaceae. <em>In</em>: Sharma, B.D., Balakrishnan, N.P., Rao, R.R. & Hajra, P.K. (Eds.) <em>Flora of India</em>, vol. 1. Botanical Survey of India, Calcutta, pp. 1–145.</p>
<p>Turland, N.J., Wiersema, J.H., Barrie, F.R., Greuter, W., Hawksworth, D.L., Herendeen, P.S., Knapp, S., Kusber, W.-H., Li, D.-Z., Marhold, K., May, T.W., McNeill, J., Monro, A.M., Prado, J., Price, M.J. & Smith, G.F. (2018) <em>International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code)</em>. <em>Regnum Vegetabile </em>159. Koeltz Botanical Books, Glashütten, 254 pp. https://doi.org/10.12705/Code.2018</p>
<p>Wang, W.T. (1982a) Notulae de Ranunculaceis sinensibus (V). <em>Acta Botanica Yunnanica</em> 4: 129‒137.</p>
<p>Wang, W.T. (1982b) <em>Thalictrum</em> L. <em>In</em>: Wang, W.T. (Ed.) <em>Iconographia Cormophytorum Sinicorum</em>, suppl. 1. Science Press, Beijing, pp. 410‒431.</p>
<p>Wang, W.T. (1985) <em>Thalictrum</em> L. <em>In</em>: Wu, C.Y. (Ed.) <em>Flora Xizangica</em>, vol. 2. Science Press, Beijing, pp. 63‒76.</p>
<p>Wang, W.T. (1993) <em>Thalictrum</em> L. <em>In</em>: Wang, W.T. (Ed.) <em>Vascular Plants of the Hengduan Mountains</em>, vol. 1. Science Press, Beijing, pp. 495‒505.</p>
<p>Wang, W.T. (2000a) <em>Thalictrum</em> L.<em> In</em>: Wu, Z.Y. (Ed.) <em>Flora Yunnanica</em>, vol. 11. Science Press, Beijing, pp. 153–177.</p>
<p>Wang, W.T. (2000b) <em>Thalictrum</em> L. <em>In</em>: Fu, L.K. & Hong, T. (Eds.) <em>Higher Plants of China</em>, vol. 3. Qingdao Publishing House, Qingdao, pp. 459‒481.</p>
<p>Wang, W.T. (2018a) <em>Thalictrum nepalense</em>, a new species of Ranunculaceae from Nepal. <em>Bulletin of Botanical Research</em> 38: 641‒643.</p>
<p>Wang, W.T. (2018b) <em>Thalictrum (Ranunculaceae) in China</em>. Peking University Press, Beijing, 376 pp.</p>
<p>Wang, W.T. & Wang, S.H. (1979a) Addenda. <em>In</em>: Anonymous (Ed.) <em>Flora Reipublicae Popularis Sinicae, </em>vol. 27. Science Press, Beijing, pp. 603–622.</p>
<p>Wang, W.T. & Wang, S.H. (1979b) <em>Thalictrum</em> L. <em>In</em>: Anonymous (Ed.) <em>Flora Reipublicae Popularis Sinicae</em>, vol. 27. Science Press, Beijing, pp. 502–592.</p>
<p>Wu, C.Y. (1984) <em>Index Florae Yunnanensis</em>, vol. 1. Yunnan People’s Publishing House, Kunming, 1070 pp.</p>
<p>Wu, Y.H. (2008) <em>The Vascular Plants and Their Eco-Geographical Distribution of the Qinghai-Tibetan Plateau</em>. Science Press, Beijing, 1369 pp.</p>
<p>Yonekura, K. (2008) Ranunculaceae. <em>In</em>: Ohba, H., Iokawa, Y. & Sharma, L.R. (Eds.) <em>Flora of Mustang, Nepal</em>. Kodansha Scientific Ltd., Tokyo, pp. 61‒94.</p>
<p>Zeng, Y.P., Yuan, Q. & Yang, Q.E. (2021) <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</p>
<p>Zeng, Y.P., Yuan, Q. & Yang, Q.E. (2022) <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</p>