鼓槌石斛 Dendrobium chrysotoxum Lindl.
金弓石斛（云南种子植物名录）
Dendrobium chrysotoxum Lindl. （1847）*；Hook. （1858）*；Hook. f. （1890）；Finet（1898）；Kranzl. in Engl. （1910）；Gagnep. in Lecomte（1932）；Kerr（1933）；S. Y. Hu（1973）；图鉴（1976）*；Z. H. Tsi（1980）；Seidenf. （1985）*；Averyanov（1990，1992）；Z. H. Tsi et S. C. Chen（1995）；Z. H. Tsi，S. C. Chen et K. Mori（1997）*；中国兰花全书（1998）*；中国植物志（1999）*. Dendrobium suavissimum Rchb. f. （1874）：D. chrysotoxum Lindl. var. suavissimum（Rchb. f. ）Hook. f. ex Veitch（1888）.
Epiphytic on tree trunks in sunny evergreen broad-leaved forests, lithophytic on rocks in open forests; 500-1600 m. S and W Yunnan [NE India, Laos, Myanmar, Thailand, Vietnam]. |
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Stem pseudobulbous, erect, fusiform, 6-30 cm, 1.5-5 cm in diam. at middle, with 2-5 internodes, with many bluntly rounded ridges, golden yellow when dry. |
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Leaves 2-5, subterminal, oblong, to 19 × 2-3.5 cm or wider, leathery, base contracted, not decurrent into clasping sheaths, apex acute and hooked. |
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Inflorescence subterminal, ascending or slightly pendulous, to 20 cm, laxly many flowered; peduncle and rachis stout, basal sheaths 4 or 5; floral bracts ovate-lanceolate, 2-3 mm, membranous, apex acute. Pedicel and ovary to 5 cm. Flowers slightly fragrant, thickly textured, golden yellow, lip deeper golden yellow with red stripes on each side at base, anther cap pale yellow. Dorsal sepal oblong, 12-20 mm, 5-9 mm wide at middle, 7-veined, slightly obtuse; lateral sepals nearly equal to dorsal sepal; mentum subglobose, ca. 4 mm wide. Petals oblanceolate, ca. as long as dorsal sepal, ca. 2 × as wide as sepals, ca. 10-veined, margin minutely dentate, apex rounded; lip nearly reniform-orbicular, ca. 20 × 23 mm, adaxially densely pubescent, margin undulate, apex shallowly bilobed; disk often V-shaped, raised, sometimes with U-shaped chestnut spots. Column ca. 5 mm; anther cap tower-shaped. Flowering 3-May. |
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