3. Amitostigma simplex Tang & F. T. Wang, Bull. Fan Mem. Inst. Biol. Bot. 10: 25. 1940.
黄花无柱兰 huang hua wu zhu lan
Plants 5-14 cm tall. Tubers ovoid to subglobose, 4-5 mm in diam. Stem with 1 or 2 tubular sheaths at base, 1-leaved. Leaf basal, porrect, linear to oblong-elliptic, 1.5-4 × 0.3-0.6 cm, apex acute or obtuse. Peduncle ebracteate; rachis 1-flowered; floral bracts lanceolate, 6-10 mm, nearly as long as ovary, apex acute or acuminate. Flower erect, yellow, sometimes spotted with brown, rather large; ovary and pedicel 8-9 mm. Dorsal sepal narrowly oblong, concave, 3.8-6 × 1.3-3 mm, 1-veined, apex obtuse; lateral sepals spreading, narrowly oblong-elliptic, falcate, 4.2-8 × 1.5-4 mm, 1-veined, apex obtuse. Petals connivent with dorsal sepal and forming a hood, ovate, oblique, 3.7-5.5 × 1.8-3.5 mm, 1-veined, apex obtuse; lip broadly obovate, 7-15 × 6-13 mm, deeply 3-lobed near middle; lateral lobes oblong-obovate, falcate, 3-7 × 3-6 mm, apex rounded; mid-lobe obcordate to flabellate, 3-5 × 4-8 mm, margin undulate, apex emarginate to shallowly notched to form 2 small lobules; spur pendulous, cylindric, 3-4 mm, much shorter than ovary, apex obtuse. Fl. Jul-Aug.
● Grassy slopes; 2300-4400 m. W Sichuan, NW Yunnan.