Abstract
Bulbophyllum xuansonii belonging to section Brachystachyae, discovered in Ninh Binh and Son La provinces is described here as a new species for science. This species is similar to B. xylophyllum and B. gracilipes but can be easily distinguished by the smaller habit and shape of tepals and stelidia. Additionally, B. gracilipes found in Lam Dong Province is reported as the species newly recorded for the flora of Vietnam. The paper provides analytical photos and data on phenology, ecology, and distribution of studied species. Morphological characters of the new species and similar species are shortly discussed. The key for identification of species of B. sect. Brachystachyae in Vietnam is also included.
References
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<p>Nong, V.D. & Averyanov, L.V. (2015) <em>Bulbophyllum bidoupense</em> and <em>Schoenorchis hangianae</em>—new species of orchids (Orchidaceae) from southern Vietnam. <em>Phytotaxa</em> 213 (2): 113–121. https://doi.org/10.11646/phytotaxa.213.2.4</p>
<p>Pearce, N.R. & Cribb, P.J. (2002) <em>The orchids of Bhutan, Flora of Bhutan</em>. Edinburgh: Royal Botanic Garden Edinburgh. 643 pp.</p>
<p>Pridgeon, A.M., Cribb, P.J., Chase, M.W. & Rasmussen, F.N. (2014) Genera orchidacearum 6. Epidendroideae 3. Oxford University Press, Oxford, 544 pp.</p>
<p>Reichenbach, H.G. (1874) Enumeration of the orchids collected by the Rev. E. C. Parish in the neighborhood of Moulmein, with descriptions of the new species. <em>Transactions of the Linnean Society</em> 30: 133–157. https://doi.org/10.1111/j.1096-3642.1874.tb00004.x</p>
<p>Seidenfaden, G. (1979) Orchid genera in Thailand 8: Bulbophyllum. <em>Dansk Botanisk Arkiv</em> 33 (3): 1–228.</p>
<p>Thouars, L.M.A. Du Petit (1822) <em>Histoire particulière des plantes orchidées recueillies dans les trois îles australes de d’Afrique, de France, de Bourbon et de Madagascar.</em> L’auteur, Arthus Bertrand, Treuttler et Wurtz, Paris.</p>
<p>Wei, L.M, Lang, K.Y. & Yu, D.L. (2010) <em>Bulbophyllum xylophyllum</em>, a new record of Orchid species from China. <em>Guihaia</em> 30 (4): 446–447.</p>