Abstract
The paper presents a taxonomic review of Bulbophyllum section Rhytionanthos for the flora of Vietnam and provides the key for its species’ identification. A new species, B. truongtamii and a new variety, B. taeniophyllum var. denticulatoalatum are described for science. Bulbophyllum nodosum is reported for the first time from the country. Bulbophyllum strigosum, described 20 years ago based on cultivated plant of uncertain origin was rediscovered in NE Vietnam. For this species, location and detailed description are reported. Analytical photos, data on phenology, ecology, and distribution are presented for all studied species. The morphological comparison table of the new species, new variety and newly recorded species segregating them from similar species are presented.
References
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<p>Averyanov, L.V. & Averyanova, A.L. (2003) <em>Updated Checklist of the Orchids of Vietnam</em>. Vietnam National University Publishing House. 101 pp.</p>
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<p>Rolfe, R.A. (1895) New orchids 13. <em>Bulletin of miscellaneous information (Royal Gardens, Kew)</em> 1895: 33–37. https://doi.org/10.2307/4115490</p>
<p>Seidenfaden, G. (1973) Notes on <em>Cirrhopetalum</em> Lindl. <em>Dansk Botanisk Arkiv</em> 29: 1–260.</p>
<p>Seidenfaden, G. (1979) Orchid genera in Thailand 8: <em>Bulbophyllum</em>. <em>Dansk Botanisk Arkiv</em> 33 (3): 1–228.</p>
<p>Seidenfaden, G. (1992) The Orchids of Indochina. <em>Opera Botanica</em> 114: 1–502. https://doi.org/10.1111/j.1756-1051.1993.tb00015.x</p>
<p>Schlechter, R. (1913) Die Orchidaceen von Deutsch-New-Guinea. <em>In:</em> <em>Repertorium Specierum Novarum Regni Vegetabilis.</em> Beihelft 1. pp. 1–1079.</p>
<p>Smith, J.J. (1912) <em>Bulbophyllum</em> Thou. Sect. <em>Cirrhopetalum</em>. <em>Bulletin du Jardinbotanique de Buitenzorg</em> Ser. 2, no. 8: 19–29.</p>
<p>Smith, W.W. (1921) New orchids from Yunnan an Northern Burma. <em>Notes from the Royal Botanic Garden, Edinburgh</em> 13: 189–222.</p>
<p>Verma, D. & Lavania, S. (2014) Additions to the Orchid flora of Meghalaya, India. <em>Richardiana</em> 15: 105–114.</p>
<p>Vermeulen, J.J., Schuiteman, A. & De Vogel, E.F. (2014) Nomenclatural changes in Bulbophyllum (Orchidaceae; Epidendroideae). <em>Phytotaxa</em> 166 (2): 101–113. https://doi.org/10.11646/phytotaxa.166.2.1</p>
<p>Averyanov, L.V. & Averyanova, A.L. (2003) <em>Updated Checklist of the Orchids of Vietnam</em>. Vietnam National University Publishing House. 101 pp.</p>
<p>Averyanov, L.V., Nguyen, S.K., Nguyen, T.T., Nguyen, P.T., Nong, V.D., Nguyen, V.C. & Chu, X.C. (2015) New orchids in the flora of Vietnam. <em>Wulfenia</em> 22: 137–188.</p>
<p>Bennet, S.S.R. (1983) <em>Bulbophyllum yoksunense</em> var. <em>geei</em> (A.S.Rao & N.P.Balakr.) Bennet. <em>Journal of Economic and Taxonomic Botany</em> 4: 592.</p>
<p>Bull, W. (1891) New plants: <em>Cirrhopetalum mundulum</em>. <em>The Gardeners’ chronicle </em>9: 676–677.</p>
<p>Chen, X. & Vermeulen, J.J. (2009) <em>Bulbophyllum</em>. <em>In:</em> Wu, Z.Y., Raven, P.H. & Hong, D.Y. (Eds.) <em>Flora of China.</em> Vol. 25. (Orchidaceae). Science Press, Beijing and Missouri Botanical Garden Press, St. Louis, pp. 404–440.</p>
<p>Chowlu, K & Rao, N.A. (2014) Four new records of <em>Bulbophyllum</em> (Orchidaceae) for Manipur, Inda. <em>Richardiana</em> 15: 151–160.</p>
<p>Garay, L.A., Hamer, F. & Siegerist, E.S. (1994) The genus <em>Cirrhopetalum</em> and the genera of the <em>Bulbophyllum</em> alliance. <em>Nordic Journal of Botany</em> 14: 609–646. https://doi.org/10.1111/j.1756-1051.1994.tb01080.x</p>
<p>Garry, L.A. (1999) Orchid species currently in cultivation. <em>Harvard Papers in Botany</em> 4 (1): 301–319.</p>
<p>Hooker, J.D. (1890) <em>Flora of British India 5</em>. London. 910 pp.</p>
<p>Finet, A.E. (1897) Orchidées nouvelles: <em>Bolbophyllum pectinatum; Cirropetalum emarginatum</em>. <em>Bulletin de la Société botanique de France</em> 44: 268–269.</p>
<p>Koenig, J.G. (1791) <em>Descriptiones Epindendrorum in India Orientali factae</em>. <em>In:</em> Retzius, A.J. (Ed.) <em>Fasciculus Observationum Botanicarum</em> 6. Leipzig, pp. 43–67.</p>
<p>Kuntze, O. (1891) <em>Revisio generum plantarum</em> 2. Leipzig. 1011 pp.</p>
<p>Lindlley, J. (1838) <em>Cirrhopetalum </em>cornutum in Miscellaneous notices 24. <em>Edwards’s botanical register</em> (Misc.) 24: 75.</p>
<p>Pearce, N.R. & Cribb, P.J. (2002) <em>The orchids of Bhutan</em>. Vol. 3, Part 3. Royal Botanic Garden Edinburgh, Kew and Royal Government of Bhutan, 643 pp.</p>
<p>Rao, A.S. & Balakrishnan, N.P. (1968) <em>Bulbophyllum brachypodum</em> <em>nom. nov.</em> with two new varieties. <em>The bulletin of the Botanical survey of India</em> 10: 350–352.</p>
<p>Reichenbach, H.G. (1874a) Contributions to Orchidology, new orchids discovered by the Rev. C. Parish, at Moulmein. <em>Journal of botany, British and foreign</em> 12: 196–199.</p>
<p>Reichenbach, H.G. (1874b) <em>Bulbophyllum simillimum</em> and <em>Cirrhopetalum</em> <em>simillimum</em> in <em>Orchidaceae E.C. Parishianae burmenses</em>. Otia botanica Hamburgensia. 89 pp.</p>
<p>Ridley, H.N. (1911) Orchidaceae in The Flora of lower Siam. <em>Journal of the Straits Branch of the Royal Asiatic Society</em> 59: 15–26.</p>
<p>Ridley, H.N. (1924) <em>Bulbophyllum punctatissimum</em> in Orchidaceae. <em>In:</em> <em>The flora of the Malay Peninsula 4: Monocotyledones</em>. London, L. Reeve & co., ltd. 383 pp.</p>
<p>Rolfe, R.A. (1895) New orchids 13. <em>Bulletin of miscellaneous information (Royal Gardens, Kew)</em> 1895: 33–37. https://doi.org/10.2307/4115490</p>
<p>Seidenfaden, G. (1973) Notes on <em>Cirrhopetalum</em> Lindl. <em>Dansk Botanisk Arkiv</em> 29: 1–260.</p>
<p>Seidenfaden, G. (1979) Orchid genera in Thailand 8: <em>Bulbophyllum</em>. <em>Dansk Botanisk Arkiv</em> 33 (3): 1–228.</p>
<p>Seidenfaden, G. (1992) The Orchids of Indochina. <em>Opera Botanica</em> 114: 1–502. https://doi.org/10.1111/j.1756-1051.1993.tb00015.x</p>
<p>Schlechter, R. (1913) Die Orchidaceen von Deutsch-New-Guinea. <em>In:</em> <em>Repertorium Specierum Novarum Regni Vegetabilis.</em> Beihelft 1. pp. 1–1079.</p>
<p>Smith, J.J. (1912) <em>Bulbophyllum</em> Thou. Sect. <em>Cirrhopetalum</em>. <em>Bulletin du Jardinbotanique de Buitenzorg</em> Ser. 2, no. 8: 19–29.</p>
<p>Smith, W.W. (1921) New orchids from Yunnan an Northern Burma. <em>Notes from the Royal Botanic Garden, Edinburgh</em> 13: 189–222.</p>
<p>Verma, D. & Lavania, S. (2014) Additions to the Orchid flora of Meghalaya, India. <em>Richardiana</em> 15: 105–114.</p>
<p>Vermeulen, J.J., Schuiteman, A. & De Vogel, E.F. (2014) Nomenclatural changes in Bulbophyllum (Orchidaceae; Epidendroideae). <em>Phytotaxa</em> 166 (2): 101–113. https://doi.org/10.11646/phytotaxa.166.2.1</p>