24. Platanthera arcuata Lindley, Gen. Sp. Orchid. Pl. 289. 1835.
弧形舌唇兰 hu xing she chun lan
Habenaria arcuata (Lindley) J. D. Hooker.
Stem erect, robust, 2- or more leaved. Leaves cauline, oblong or oblong-lanceolate, 6.5-10.2 cm, base clasping, apex acute. Rachis laxly many flowered; floral bracts foliaceous, linear-lanceolate, 15-38 mm, lower ones exceeding flowers, apex acuminate. Flowers large; pedicel and ovary arcuate, ca. 35 mm. Dorsal sepal cymbiform, ca. 8 mm; lateral sepals deflexed, oblong, slightly larger than dorsal sepal, 3-veined, apex obtuse. Petals linear, 1-veined; lip linear-ligulate, entire, with small lateral lobes at base, margin reflexed; disk puberulous; basal lobes rounded; spur cylindric, slender, 50-64 mm, exceeding ovary, incurved, apex acute. Column stout; anther locules divergent; pollinia obovoid, with stout, short caudicles and large, ovate viscidia; rostellum broadly triangular.
Grasslands. Xizang [Bhutan, NE India, Nepal].
The present authors saw no Chinese specimens of this species. It was reported from Xizang by Press et al. (Annot. Checkl. Fl. Pl. Nepal, 223. 2000).