密花石斛（中国高等植物图鉴）
Dendrobium densiflorum Lindl. in Wall. Pl. As. Rar. 1: 34, t. 40. 1830, et Gen. Sp. Orch. Pl.: 90. 1830 (quoad descr.); Hook in Bot. Mag. 62: t. 3418. 1835; Lindl. in Bot. Reg. 21: t. 1828. 1836; Hook. f., Fl. Brit. Ind. 5: 748. 1890, p. p.; King et Pantl. in Ann. Bot. Gard. Calcutta 8: 56, pl 79. 1898; Kraenzl. in Engler, Pflanzenr. 45 (IV. 50, II. B. 21): 66. 1910 (excl. cit.); Tuyama in H. Hara, Fl. East. Himal. 1: 432. 1966, et 2: 184. 1971; 中国高等植物图鉴 5: 702, p. p. 图8233. 1976; 海南植物志 4: 222. 1977; H. Hara et al., Enum. Flow. Pl. Nepal 1: 39. 1978; Z. H. Tsi in Acta Phytotax. Sin. 18 (4): 437. 1980, p. p.; Seidenf. in Opera, Bot. 83: 23, fig. 8. 1985; Z. H. Tsi, S. C. Chen et K. Mori, Wild Orch. China: 71, Pl. 82. 1997; 中国兰花全书: 163. 图6-11 (4). 1998.——D. amabile auct. non (Lour.) O'Brien: S. Y. Hu in Qrart. J. Taiwan Mus. 26 (1, 2): 151. 1973.
Epiphytic on tree trunks in evergreen broad-leaved forests, lithophytic on rocks in mountain valleys; 400-1000 m. N Guangdong, Guangxi, Hainan, SE Xizang [Bhutan, NE India, Myanmar, Nepal, N Thailand].
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Stems strongly clavate, swollen, ± pseudobulbous at base, 25-40 cm, to 2 cm in diam., internodes clavate, expanding to a swollen node, obscurely 4-angled, sometimes ridges inconspicuous, yellow, pale brown and glossy when dry, sheathless.
Note : This species is easy to be confused with Dendrobium glomeratum. The main difference is that the stems of this species are usually rod-shaped or spindle-shaped, with obvious 4 edges. Sepals and petals light yellow. |
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Leaves 3 or 4, subterminal, oblong-lanceolate, 8-17 × 2.6-6 cm, leathery, base not decurrent into clasping sheath, apex acute. |
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Inflorescence subterminal, pendulous, densely many flowered; peduncle with 2-4 sheaths at base; rachis 6-16 cm; floral bracts broadly oblong or obovate, 12-15 × 6-10(or more) mm, membranous, strongly ca. 10-veined, revolute, obtuse. Pedicel and ovary whitish green, 2-2.5 cm. Flowers spreading, 3-4 cm in diam.; sepals and petals pale yellow, lip golden yellow, column and anther cap orange-yellow. Dorsal sepal ovate, 17-21 × 8-12(or more) mm, 5-veined, obtuse; lateral sepals nearly as large as dorsal sepal, ovate-lanceolate, 5- or 6-veined, apex subacute; mentum subglobose, ca. 5 mm wide. Petals suborbicular, 15-20 × 11-15 mm, with 3 main veins and many secondary veins, base contracted into a short claw, margin erose above middle; lip orbicular-rhombic, 17-22 × up to 22 mm, both surfaces densely lanate above middle, shortly clawed, both sides embracing column below middle, apex rounded. Column ca. 4 mm; anther cap compressed subglobose or conic, front margin truncate, finely notched.Flowering April - May. |
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