Bulbophyllum annamense (Garay) Sieder & Kiehn (2009: 406)

Truong, Ba Vuong, Averyanov, Leonid V., Maisak, Tatiana V., Dang, Minh Quan, Nguyen, Van Canh, Amlser, Roland, Nguyen, Quoc Bao & Dang, Van Son, 2023, Bulbophylum sect. Cirhopetallum s. str. (Orchidaceae) in Vietnam with the description of a new species, B. thangii, and a new national record, B. fenestratum, Phytotaxa 625 (2), pp. 201-210 : 202

1. Bulbophyllum annamense (Garay) Sieder & Kiehn (2009: 406) , Ormerod & Truong (2021: 443)

( Fig. 1 )

≡ Cirrhopetalum annamense Garay (1999: 306) .

Type:— VIETNAM. Lam Dong Province: Annam, Prenn , 1000 m, 1954, T. Sigaldi 144 ( C. R. S. T. 151) (holotype P 00362049 !).

= Cirrhopetalum roseopunctatum Garay, Hamer & Siegerist (1995: 179) .

Type:— VIETNAM. Lam Dong Province: Langbian Plateau, fl. in cult. 1990, L.V. Tempera s.n. (holotype AMES 00085017!, spirit), non B. rosopunctatum Schltr (1913: 770) . ≡ Bulbophyllum schwarzii Sieder & Kiehn (2011: 316) .

Habitat and phenology: —Epiphyte on tree branches or trunks, at elevation of 1000–1300 m a.s.l., often along streams. Flowers in May–June.

Distribution: —Endemic to southern Vietnam (Dak Lak and Lam Dong provinces).

Conservation assessment: —The species is endemic to Vietnam and, is so far known only from six sites, all of which are facing a decline in the quality of habitat as a result of logging, and hence, these sites are considered as unique locations.Plants are also known to be collected for horticulture purposes.The extent of occurrence and area of occupancy are calculated as 239 km 2 and 24 km 2, respectively. The number of mature individuals and the generation length of the species are not known. Accordingly, this species can be assessed as vulnerable, VU B1ab(iii,v)+B2ab(iii,v).

Note: —This species is sometimes considered as a synonym of B. longiflorum . However, B. annamense clearly differs from B. longiflorum in the petals hardly hairy along the margin of the apical half (vs. margin fimbriate throughout), the surface of the petals is smooth to slightly papillose (vs. surface prominently warty or colliculate), and the lip with auricles, hairy along the margin at the base (vs. lip glabrous, without auricles).

Specimens examined: — VIETNAM: Dak Lak province, 2014, Kuznetsov, Kuznetsova, Nuraliev 918 (photo LE01087138 https://en.herbariumle.ru/?t=occ&id=18662, LE01055727 https://en.herbariumle.ru/?t=occ&id=15092); Lam Dong province, 2010, Averyanov s.n. (photo LE01087139 https://en.herbariumle.ru/?t=occ&id=18663); Lam Dong province, 2022, Averyanov et al. AL 1359 (photo LE01123437 https://en.herbariumle.ru/?t=occ&id=137227); Lam Dong, 2020, Truong Ba Vuong & Ngo Quang Dang BV 628 (VNM, analytical photos LE01124299 https:// en.herbariumle.ru/?t=occ&id=186070).

Figures

FIGURE 1. Bulbophyllum annamense. A. Flowering plant. B. Leaf apex, adaxial side. C. Inflorescence with peduncle. D. Inflorescence. E. Flower, half-side view. F. Flower, with lateral sepals removed, side view. G. Dorsal sepal, abaxial and adaxial side. H & I. Apex of median sepal. J. Lateral sepals, adaxial and abaxial side. K. Petals, abaxial and adaxial side. L. Lip, views from different sides. M. Pedicel, ovary, and column, side view. N. Ovary and column, side view. O. Column apex. P. Anther cap, view from above and from below. Q. Pollinaria.All photo by Truong Ba Vuong from specimen BV 628, photo correction and design by L. Averyanov and T. Maisak.