矩唇石斛
Dendrobium linawianum Rchb. f. in Walp. Ann. Bot. Syst. 6: 284. 1861; Rolfe in J. Linn. Soc. Bot. 36: 12. 1903; Kraenzl. in Engler, Pflanzern. 45 (IV. 50, II. B. 21): 31. 1910; Hayata in J. Coll. Sci. Univ. Tokyo 30: 313. 1911; Schltr. in Fedde Repert. Sp. Nov. Beih. 4: 211. 1919; S. Y. Hu in Quart. J. Taiwan Mus. 26 (1, 2): 156. 1973; 台湾兰科植物1: 132-133 (图). 1975; 中国高等植物图鉴5: 695. 1976; 台湾植物志 5: 962. 图1580. 1978; Z. H. Tsi in Acta Phytotax. Sin. 18 (4): 441. 1980; 台湾兰科植物彩色图志 1: 371. 彩色图版85.1996. ——D. moniliforme auct. non Sw. : Lindl. in Bot. Reg. 16: t. 1314. 1830; Hook. in Bot. Mag. 71: t. 4153. 1845. ——D. alboviride Hayata, Icon. Pl. Formos. 9: 108, fig. 36. 1920.
Epiphytic on tree trunks in mountain forests; 400-1500 m. E Guangxi (Jinxiu), Taiwan. The body shape, flower size and color of this species are similar to those of Dendrobium nobile. The main difference is that their lip shapes are different. |
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Stems erect, cylindric, somewhat compressed, usually 25-30 cm, stout, 1-1.5 cm in diam., unbranched, lower part narrowed, with several nodes, internodes slightly obconic, 3-4 cm, longitudinally grooved, yellowish brown when dry. |
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Leaves oblong, 4-7(-10) × 2-2.5 cm, leathery, base dilated into clasping sheaths, apex obtuse and unequally bilobed. |  |
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Inflorescence from old leafless stems, 2-4-flowered; peduncle 7-8 mm; basal sheaths 2 or 3, tubular, short; floral bracts ovate, 3-4 mm, apex acute. Pedicel and ovary to 5 cm; ovary slightly arcuate. Flowers spreading, large, white, sometimes upper part purplish red; lip white, upper part purplish red, disk with purplish red stripes on each side at base, anther cap white. Dorsal sepal oblong, 22-35 × 7.5-9.5(or more) mm, 5-veined, slightly obtuse; lateral sepals ± obliquely oblong, ca. as large as dorsal sepal, 5-veined, base oblique, apex slightly obtuse; mentum narrowly conic, ca. 8 mm. Petals elliptic, 22-35 mm, much broader than sepals, shortly clawed, obtuse; lip broadly oblong, ca. as large as petals or slightly smaller, both sides embracing column below middle, adaxially densely pubescent, shortly clawed, both lateral margins denticulate below middle, front reflexed, obtuse. Column ca. 4 mm, foot ca. 8 mm; anther cap glabrous. Flowering : April - May. |
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