13. Amitostigma trifurcatum Tang, F. T. Wang & K. Y. Lang, Acta Phytotax. Sin. 20: 80. 1982.
三叉无柱兰 san cha wu zhu lan
Plants 24-36 cm tall. Tubers globose, 7-10 mm in diam. Stem with 2 tubular sheaths at base, 1-leaved. Leaf cauline, porrect, narrowly oblong-lanceolate, 5.5-7.5 × 0.5-0.7 cm, apex acute. Peduncle with 2 occasionally foliaceous sterile bracts; rachis 2-6 cm, subdensely 6-9-flowered; floral bracts lanceolate, 4-5 mm, shorter than ovary, apex acuminate. Flowers secund, rose-pink with darker spots on lip; ovary and pedicel 6-7 mm. Dorsal sepal erect, narrowly elliptic-lanceolate, 3-4 × 1-1.5 mm, 1-veined, apex subacute; lateral sepals spreading to reflexed, narrowly elliptic-lanceolate, slightly oblique, 3.2-4.2 × 1-1.5 mm, apex subacute. Petals forming a hood to erect, narrowly ovate-lanceolate, slightly oblique, 3-3.8 × ca. 1.5 mm, 1-veined, apex subacute; lip narrowly elliptic, 5-7.5 × 2.4-3 mm, with 5 stout, raised veins, 3-lobed below middle; lateral lobes lanceolate to narrowly triangular, 1-1.5 × ca. 0.3 mm, apex obtuse or acute; mid-lobe oblong-ligulate, 3.5-4 × 1-1.5 mm, apex obtuse; spur pendulous, subconic to broadly cylindric, 1-1.5 mm, apex obtuse; viscidia narrowly ovate, large; stigma lobes subclavate. Fl. Sep.
● Marshes, wet grasslands; ca. 2900 m. NW Yunnan.