少花石斛（植物分类学报）
Dendrobium parciflorum Rchb. f. ex Lindl. in J. Linn. Soc. Bot. 3: 4. 1859; Hook. f., Fl. Brit. Ind. 5: 725. 1890; Kraenzl. in Engler, Pflanzenr. 45 (IV. 50, II. B. 21): 222. 1910, p. p.; Seidenf. in Opera Bot. 83: 235, fig. 160. 1985; Averyanov, Vasc. Pl. Syn. Vietnam. Fl. 1: 78. 1990; Seidenf., l. c. 114: 254. 1992; Averyanov, Iden. Guide Vietnam, Orch.: 212. 1994; Z. H. Tsi et S. C. Chen in Acta Phytotax. Sin. 33 (3): 292. 1995.
On trees in open forests, on trunks of Podocarpus in forests; ca. 1500 m. S Yunnan (Jinghong) [NE India, Laos, Thailand, Vietnam]. |
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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. |
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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. |
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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. |
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