报春石斛（云南植物研究）
Dendrobium primulinum Lindl. in Gard. Chron. : 400. 1858; Hook. f., Fl. Brit. Ind. 5: 735. 1890; Duthie in Ann. Bot. Gard. Calcutta 9: 97, pl. 98. 1906; Kraenzl. in Engler, Pflanzenr. 45 (IV. 50, II. B. 21): 39. 1910; H. Hara et al., Enum. Flow. Pl. Nepal 1: 40. 1978; S. J. Cheng et C. Z. Tang in Acta Bot. Yunnan. 3: 283. 1984; Seidenf. in Opera Bot. 83: 69, fig. 39. 1985; Averyanov, Vasc. Pl. Syn. Vietnam. Fl. 1: 80. 1990; Seidenf., l. c. 114: 232. 1992; Ave ryanov, Iden. Guide Vietnam. Orch. : 191. 1994; Z. H. Tsi et S. C. Chen in Acta Phytotax. Sin. 33 (3): 292. 1995; Z. H. Tsi, S. C. Chen et K. Mori, Wild Orch. China: 83, pl. 105. 1997; 中国兰花全书: 170. 图6-13 (5). 1998. ——D. nobile Lindl. var. pallidiflorum Hook, in Bot. Mag. 83: t. 5003. 1857; S. Y. Hu in Quart. J. Taiwan Mus. 26 (1): 159. 1973.
Epiphytic on tree trunks in open forests; 700-1800 m. S Yunnan [N India, Laos, Myanmar, Nepal, Thailand, Vietnam].
本种酷似兜唇，区别在于本种的茎较粗短，花序柄从茎节的凹下处发出，花瓣几乎与萼片等宽，易于区别。
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Stems pendulous, cylindric, usually 20-35 cm, stout, 8-13 mm in diam., fleshy, unbranched, deciduous, with many nodes, internodes 2-2.5 cm. |
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Leaves alternate along entire stem, lanceolate or ovate-lanceolate, 8-10.5 × 2-3 cm, papery, apex obtuse and unequally bilobed; leaf sheath papery or membranous. |
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Inflorescence arising from old stems after leaves have fallen, 1-3-flowered; peduncle penetrating 2 sheaths, cymbiform-concave, ca. 2 mm; basal sheaths 3 or 4, 2-3 mm, membranous; floral bracts pale white, ovate, 5-9 mm, membranous, apex obtuse. Pedicel and ovary yellowish green, 2-2.5 cm. Flowers spreading, pendulous; sepals and petals pale roseate or white (D. cretaceum), lip pale yellow with pale roseate tip, disk with purplish red stripes, column white, anther cap purple. Dorsal sepal narrowly lanceolate, ca. 30 × 6-8(or more) mm, 3-5-veined, subacute; lateral sepals similar in size and shape, 3-5-veined, base oblique, apex subacute; mentum narrowly conic, ca. 5 mm, obtuse. Petals narrowly oblong, ca. 30 × 7-9 mm, 3-5-veined, margin entire, apex obtuse; lip broadly obovate, shorter than wide, ca. 35 mm wide, both sides embracing column in lower half, both surfaces densely pubescent, margin irregularly denticulate. Column ca. 3 mm; anther cap elliptic-conic, densely papillate-hairy, front margin broadly emarginate, apex ± concave. |
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