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

18. Amitostigma yuanum Tang & F. T. Wang, Bull. Fan Mem. Inst. Biol. Bot. 10: 26. 1940.

齿片无柱兰 chi pian wu zhu lan

Plants 7.5-15 cm tall. Tubers globose, 3-5 mm in diam. Stem with 1 or 2 tubular sheaths at base, 2-leaved. Leaves cauline, erect to porrect, widely spaced, narrowly ovate, oblong-lanceolate, or oblanceolate, 0.6-3.5 × 0.3-0.6 mm, apex acute. Peduncle ebracteate; rachis 1- or 2-flowered; floral bracts narrowly ovate to oblong-lanceolate, 7-8 mm, ca. as long as ovary, apex acute or acuminate. Flowers pink or white, 1-1.5 cm in diam.; ovary and pedicel 7-8 mm. Dorsal sepal erect, concave, oblong, ca. 4 × 1.5-2 mm, 1-veined, apex obtuse; lateral sepals reflexed, ovate-oblong, slightly oblique, ca. 5 × 2.5 mm, 1-veined, apex acute. Petals loosely connivent with dorsal sepal and forming a hood, ovate, ca. 3 × 2 mm, 3-veined, margin crenulate, apex acute; lip orbicular to transversely elliptic, ca. 7 × 8.5 mm, 3-lobed toward apex; disk finely papillate; lateral lobes quadrate, oblique, ca. 2 × 2.5 mm, slightly widened toward apex, 3-veined, apical margin crenulate, apex truncate; mid-lobe subquadrate, smaller than lateral lobes, ca. 1.3 × 2 mm, 3-veined, apex truncate and shallowly notched, sinus with a small acute tooth; spur pendulous, straight to slightly incurved, cylindric, 5-7 mm, slightly shorter than ovary, slightly attenuate toward apex, apex obtuse; viscidia ellipsoid; stigma lobes oblong. Fl. Jul-Aug.

● On moss in Rhododendron thickets, alpine grasslands; 3000-3700 m. SE Xizang, NW Yunnan.


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