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FOC | Family List | FOC Vol. 25 | Orchidaceae | Peristylus

3. Peristylus densus (Lindley) Santapau & Kapadia, J. Bombay Nat. Hist. Soc. 57: 128. 1960.

狭穗阔蕊兰 xia sui kuo rui lan

Coeloglossum densum Lindley, Gen. Sp. Orchid. Pl. 302. 1832; C. flagelliferum (Makino) Maximowicz ex Makino; Glossula passerina Gagnepain; Habenaria atramentaria Kraenzlin; H. burchneroides Schlechter; H. dankiaensis Gagnepain; H. evrardii Gagnepain; H. flagellifera Makino; H. neglecta King & Pantling; H. passerina (Gagnepain) Tang & F. T. Wang; H. stenostachya (Lindley ex Bentham) Bentham; H. stenostachya subsp. burchneroides (Schlechter) Soó; Peristylus flagellifer (Makino) Ohwi; P. neglectus (King & Pantling) Kraenzlin; P. stenostachyus (Lindley ex Bentham) Kraenzlin; P. xanthochlorus Blatter & McCann; Platanthera stenostachya Lindley ex Bentham.

Plants slender to somewhat robust, 15-50(-65) cm tall. Tubers subglobose to oblong-ovoid, 0.8-2 × 0.6-1.5 cm. Stem with 2 or 3 tubular sheaths at base, 4-6-leaved. Leaves widely spaced along stem, ovate, oblong, or oblong-lanceolate, 2.5-10 × 0.6-2.5 cm, apex acute or acuminate. Inflorescence 11-38(-47) cm; peduncle cylindric to slightly ridged, slender to stout; sterile bracts several, ovate-lanceolate, to 3.5 cm; rachis 4-24 cm, laxly to subdensely many flowered; floral bracts ovate-lanceolate, 5-15 mm, basal ones often exceeding ovary, apex acuminate. Flowers erect to horizontal, yellowish green or pale green to whitish; ovary 6-10 mm including pedicel. Dorsal sepal forming a hood to erect, narrowly oblong-ovate, concave, 3-4 × 0.8-1.2 mm, 1-veined, apex obtuse; lateral sepals spreading, oblong-lanceolate, oblique, 3-4 × 0.8-1 mm, 1-veined, apex obtuse. Petals connivent with dorsal sepal and forming a hood, narrowly ovate-oblong, ca. 3 × 0.8-1 mm, 1-veined, apex obtuse; lip narrowly oblong-ovate, ca. 4.5 × 0.8 mm, divided near base by a transverse ridge into a short, concave hypochile and a longer, deflexed, deeply 3-lobed epichile, ecallose; lateral lobes spreading at right angles to axis of lip, linear, 4-7 mm; mid-lobe oblong-lanceolate, ca. 2.5 mm, apex obtuse; spur pendulous, cylindric-clavate, 3-4 mm, apex sometimes shallowly 2-lobed. Column ca. 1.5 mm; viscidia ellipsoid; rostellum with short arms. Fl. May-Oct. 2n = 25 ± 2, 42 + 0-2B, 44, 46, 48, 50.

Forests, moist grasslands; 300-2100 m. N Fujian, Guangdong, Guangxi, Guizhou, Jiangxi, Yunnan, Zhejiang [Bangladesh, Cambodia, India, Japan, Korea, Myanmar, Thailand, Vietnam].


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