头序无柱兰 tou xu wu zhu lan

Plants 8-14 cm tall. Tubers ellipsoid, 6-8 mm. Stem with 1 or 2 tubular sheaths at base, 1-leaved. Leaf cauline, porrect, narrowly elliptic to narrowly oblong, 3.5-5 × 0.5-1.5 cm, apex acute. Peduncle ebracteate; rachis 0.8-1 cm, densely several to more than 10-flowered; floral bracts lanceolate, 3-5 mm, nearly as long as ovary, apex acuminate. Flowers white; ovary and pedicel 4-6 mm. Dorsal sepal ovate-elliptic, concave, 2-2.2 × 1.5-1.7 mm, inner surface finely papillate, 1-veined, apex obtuse; lateral sepals ovate-elliptic, oblique, 2.5-3 × 2-2.2 mm, inner surfaces finely papillate, 1-veined, apex obtuse. Petals broadly ovate, oblique, 1.5-1.8 × 1.8-2 mm, inner surfaces finely papillate, 2-veined, apex obtuse; lip obovate, ca. 5 × 3.3 mm, concave at base, 3-lobed near middle; lateral lobes ovate-oblong, slightly oblique, ca. 1.5 × 0.5 mm, apex obtuse; mid-lobe oblong, ca. 1.6 × 0.5 mm, apex truncate and shallowly notched, sinus with a small, acute tooth; spur pendulous, globose, ca. 1 mm, apex rounded; viscidia oblong; stigma lobes clavate. Fl. Jul.

● Rocky soils and damp places in forests; 2600-3600 m. W Hubei, E and W Sichuan.