一柱齿唇兰 yi zhu chi chun lan

Anoectochilus densiflorus Mansfeld; A. repens (Downie) Seidenfaden & Smitinand; A. tortus (King & Pantling) King & Pantling; Odontochilus densiflorus (Mansfeld) Tang & F. T. Wang ex Merrill & Metcalf; O. repens Downie; Pristiglottis torta (King & Pantling) Averyanov.

Plants autotrophic, 18-25 cm tall. Stem ascending, stout, ca. 5 mm in diam., 5- or 6-leaved. Leaves abaxially pale green, adaxially deep green, elliptic to ovate-lanceolate, slightly oblique, 2.5-8 × 2-4.5 cm, apex acute; petiole-like base and tubular sheath 2-2.5 cm. Peduncle relatively short, stout, pubescent, with 1 or 2 sterile bracts; rachis subdensely many flowered; floral bracts ovate-lanceolate, slightly longer than ovary, outer surface pubescent, apex acuminate. Flowers resupinate; ovary and pedicel twisted, cylindric, ca. 13 mm, sparsely pubescent. Sepals purplish green with brownish purple stripes on either side of midvein, sparsely pubescent on outer surface, 1-veined; dorsal sepal forming a hood with petals, ovate, concave, ca. 8 × 4 mm, apex acute; lateral sepals spreading, oblong, oblique, ca. 9 × 3 mm, apex acute. Petals greenish white with brownish purple stripes on either side of midvein, ovate, oblique, falcate, ca. 8 × 4 mm, glabrous, 1-veined, apex apiculate; lip white, Y-shaped, ca. 17 mm; hypochile slightly dilated, globose-saccate, ca. 3 mm, aseptate, containing 2 oblong, shallowly 3-lobed calli; mesochile ca. 7 mm, with a pectinate flange along each margin; flanges composed of 4 or 5 filaments and 4 or 5 shorter obtuse teeth; epichile transversely dilated, ca. 6 × 11 mm, 2-lobed; lobes diverging widely, obovate, ca. 5.5 × 4 mm, margin crenulate, apex obtuse. Column ca. 2.5 mm, with 2 triangular-linear wings; anther narrowly ovoid, ca. 6 mm, apex acuminate; rostellum obovate, very large, ca. 3 × 2 mm, remnant deeply bifid; stigma lobes confluent, large. Fl. Jul-Sep.

Dense forests, along valleys; 400-1300 m. N and W Guangxi, Hainan, SE Xizang, S and SW Yunnan [Bhutan, Myanmar, Thailand, N Vietnam].