Dendrobium parciflorum Rchb.f. ex Lindl., J. Proc. Linn. Soc., Bot. 3: 4 (1858).
Vietnamese name: Hoàng thảo hoa treo, Lan hương
Chinise name: 少花石斛 shao hua shi hu
Common Name: The Few Small Flowered Dendrobium
Latin Name: Dendrobium parciflorum Rchb.f. ex Lindl.
Family: Orchidaceae
Synonym Name: Aporum jenkinsii Griff.; Aporum marivelense (Ames) Rauschert; Callista jenkinsii (Griff.) Kuntze; Callista perula (Rchb.f.) Kuntze; Ceraia marivelensis (Ames) Suárez; Dendrobium marivelense Ames; Dendrobium perula Rchb.f.
Eurycaulis perula (Rchb.f.) M.A.Clem.
Description:
Stems erect or ascending, compressed cylindric, 10-37(-45) cm, 2-7 mm in diam., rigid, sometimes branched, with many nodes, internodes clavate, 1-2 cm, with longitudinal ribs, yellow when dry, glossy. Leaves distichous, recurved above middle, laterally compressed and subcylindric, ensiform, 1.7-3 × 0.1-0.4(or more) cm, thickly fleshy, base dilated into clasping sheaths, apex acute or obtuse. Inflorescences bearing flowers successively one at a time from bundle of bracts, lateral on old leafy stem, 2-4 mm; basal sheaths 3 or 4, large; floral bracts ovate, 1-2 mm, membranous. Pedicel and ovary 6-15 mm, slender. Flowers fragrant, spreading, thinly textured, white or pale yellow, adaxial surface of lip with yellow spots. Dorsal sepal ovate to oblong, 3.3-12 × 2.5-5 mm, 7-veined, slightly obtuse or acute; lateral sepals ovate-triangular, ca. as long as dorsal sepal, 3.5-8 mm wide, 7- or 8-veined, base very oblique, apex acute; mentum bent forward, 10-20 × ca. 10 mm. Petals narrowly oblong to oblong, ca. 12 × 3 mm, 3-veined, obtuse or acute; lip spatulate to obovate-triangular, 15-25 × 7-10 mm, front margin undulate, emarginate; central part of disk with 2(-4) thickened raised veins terminating below lip apex, densely papillose near apex. Column 1-3 mm, foot 1-2 cm.
Distribution: Found in Assam, the eastern Himalayas, Thailand, Laos, China, and Vietnam. In VietNam, found in Bảo Lộc, Lâm Đồng.
Ecological: On trees in open forests, on trunks of Podocarpus in forests; ca. 1500 m.
Note: Dendrobium marivelense Ames is often given as a synonym of this species but it differs in blooming in the spring, has a single yellow spot without calli on the lip, obtusely triangular sidelobes and the midlobe is bilobed. D parciflorum blooms in the fall, has a long yellow central stripe with a central raised callus on the lip and no side lobes but a bilobed midlobe.
Reference:
- theplantlist.org
- efloras.org
- orchidspecies.com
- ipni.org
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