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

18. Peristylus forceps Finet, Rev. Gén. Bot. 13: 521. 1901.

一掌参 yi zhang shen

Habenaria forceps (Finet) Schlechter; H. herminioides Ames & Schlechter; Herminium forceps (Finet) Schlechter; H. liguliforme Tang & F. T. Wang; H. tsoongii Tang & F. T. Wang.

Plants slender, 15-45 cm tall. Tubers ovoid-oblong, ca. 1 cm. Stem with 2 or 3 tubular sheaths at base, 2-5-leaved. Leaves widely spaced along stem, elliptic-lanceolate to lanceolate, 4-10 × 0.8-2 cm, apex acute or acuminate, intergrading into sterile bracts above. Inflorescence 10-30 cm; peduncle cylindric, slender; sterile bracts several, often foliaceous, lanceolate, to 35 mm; rachis 8-18 cm, densely many flowered; floral bracts ovate-lanceolate, ca. 8 mm, exceeding flower, apex acuminate. Flowers horizontal, green; ovary ca. 5 mm including pedicel, glabrous to slightly pubescent. Dorsal sepal erect, ovate, 2-3 × ca. 2 mm, 3-veined, apex obtuse; lateral sepals spreading, oblong, slightly oblique, 2-3 × ca. 1.5 mm, 1- or 3-veined, apex obtuse. Petals ovate-lanceolate, slightly oblique, 2-3 × ca. 1.5 mm, fleshy above middle, 1-veined, apex obtuse; lip deflexed, ligulate-lanceolate, entire, 2.5-3.5 × 1.5-1.8 mm, sometimes abruptly narrowed above middle, abaxially carinate, ecallose, margin incurved, apex obtuse; spur pendulous, obovoid, 0.7-1 mm, much shorter than ovary, apex obtuse. Column ca. 0.8 mm; viscidia disklike; rostellum with short arms. Fl. Jun-Aug.

Abies forests, Quercus forests along valleys, grassy slopes; 1200-4000 m. S Gansu, Guizhou, W Hubei, Sichuan, SE Xizang, Yunnan.


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