烟色斑叶兰 yan se ban ye lan

Epipactis formosana (Rolfe) A. A. Eaton; E. fumata (Thwaites) A. A. Eaton; Goodyera caudatilabella Hayata; G. cyrtoglossa Hayata; G. formosana Rolfe; Orchiodes fumata (Thwaites) Kuntze; Peramium cyrtoglossum (Hayata) Makino; P. formosanum (Rolfe) Makino.

Plants terrestrial, 40-90 cm tall. Rhizome very long, stout, many noded. Stem erect, 20-50 cm, 5-7-leaved. Leaves widely spaced along stem, abaxially pale green, adaxially green, without white markings, elliptic, strongly oblique, 15-20 × 5-8 cm, base gradually contracted, apex acute; petiole-like base and tubular sheath 5-10 cm. Peduncle dark greenish brown, ca. 30 cm, pubescent, with several sterile bracts; rachis 10-30 cm, laxly to subdensely 25-50-flowered, not secund; floral bracts narrowly lanceolate, 9-12 mm, pubescent, apex acuminate. Flowers fragrant, opening widely, yellowish brown, medium-sized; pedicel and ovary cylindric-fusiform, 8-12 mm, pubescent. Sepals pubescent on outer surface, 1- or 3-veined; dorsal sepal narrowly ovate-oblong, 6-8 × ca. 2 mm, apex obtuse; lateral sepals spreading, ovate-lanceolate, oblique, 6-8 × ca. 3 mm, apex obtuse. Petals linear-oblanceolate, oblique, 7-9 × 1-1.5 mm, 1-veined, apex obtuse; lip pale brown, tinged white at apex, rhombic-orbicular, 6-7 × 3-4 mm; hypochile embracing column, concave, inside densely papillose; epichile linear-ligulate, ca. 3 mm, apex acute, recurved. Column pale brown, 5-6 mm; anther ovoid, ca. 2 mm, apex subacute; rostellum elongate, remnant shallowly bifid. Fl. Mar.

Forests; 1100-1300 m. Hainan, S Taiwan, SE Xizang, S Yunnan (Jinghong, Lancang, Mengla, Simao) [India (Deccan Plateau, Sikkim), Indonesia (Java), Japan (Ryukyu Islands), Malaysia, Myanmar, Philippines, Sri Lanka, Thailand, Vietnam].