6. Amitostigma pinguicula (H. G. Reichenbach & S. Moore) Schlechter, Repert. Spec. Nov. Regni Veg. Beih. 4: 94. 1919.
大花无柱兰 da hua wu zhu lan
Gymnadenia pinguicula H. G. Reichenbach & S. Moore, J. Bot. 16: 135. 1878; Diplomeris chinensis Rolfe; Habenaria pinguicula (H. G. Reichenbach & S. Moore) Bentham ex Rolfe; Orchis pinguicula (H. G. Reichenbach & S. Moore) Soó.
Plants 7-16 cm tall. Tubers ovoid, 10-15 mm in diam. Stem with 1 or 2 tubular sheaths at base, 1-leaved. Leaf subbasal, porrect, linear-oblanceolate, narrowly elliptic, oblong-ovate, or ligulate-oblong, 1.5-8 × 0.6-1.2 cm, apex subacute. Peduncle with 1 or 2 lanceolate sterile bracts; rachis 1- or rarely 2-flowered; floral bract linear-lanceolate, 5-6 mm, much shorter than ovary, apex acuminate. Flower rose-red to purplish red, rather large; ovary 9-17 mm including pedicel, very slender. Dorsal sepal erect, ovate, concave, 5-7 × 3-4 mm, 1-veined, apex acute; lateral sepals spreading to reflexed, ovate-lanceolate, slightly oblique, 6-8 × 3-4 mm, 2- or 3-veined, apex acute. Petals loosely connivent with dorsal sepal and forming a hood, broadly ovate, slightly oblique, 3.5-4.5 × ca. 3 mm, 3-veined, apex obtuse; lip flabellate, 11-15 × 13-19 mm, base cuneate, 3-lobed toward apex; lateral lobes broadly oblong-ovate, ca. 4 × 5 mm, apex truncate; mid-lobe broadly obovate, ca. 4 × 7.5 mm, apex truncate to slightly emarginate; spur horizontal to pendulous, straight to slightly curved, narrowly conic, 15-17 mm, usually exceeding ovary, gradually attenuate, apex acute; viscidia subovate; stigma lobes narrowly oblong. Fl. Apr-May.
● Rocky soils in forests, moist grasslands, valleys; 200-400 m. NE Zhejiang.
Diplomeris chinensis is tentatively referred to the synonymy of this species.