细天麻 xi tian ma

Gastrodia dioscoreirrhiza Hayata; G. taiwaniana Fukuyama.

Plants 10-60 cm tall. Rhizome brown, cylindric or conic, 3-10 cm, 0.3-2 cm in diam., fleshy, pilose. Peduncle pale yellow, to 50 cm, with several scattered scales at base; rachis 3-10 cm, densely 3-20-flowered; floral bracts ovate or elliptic, 2-4 mm. Flowers nodding, resupinate, yellowish brown, lip flushed orange-red toward apex; pedicel and ovary 8-15 mm; pedicel elongating to 15 cm in fruit. Perianth tube urceolate, 8-11 × 5-7 mm, with a deep sinus between lateral sepals, base inflated, outer surface smooth; free portion of sepals ovate, ca. 2 mm, apex rounded and usually 3-lobed; free portion of petals ovate, much shorter than sepal lobes; lip simple, ovate-triangular, 5-6 mm, base clawed, margin undulate, apex obtuse; claw with a pair of ellipsoid or subglobose calli; disk with 2 longitudinal lamellae, slightly papillose. Column 5-6 mm, with a pair of semilunar wings toward apex; column foot prominent; anther orbicular, ca. 1 mm. Capsule obovoid or ellipsoid, 20-23 × 7-8 mm. Fl. May-Jun.

Forests; 600-1500 m. C and N Taiwan [Japan].