20. Coelogyne assamica Linden & H. G. Reichenbach, Berliner Allg. Gartenzeitung. 25: 403. 1857.
云南贝母兰 yun nan bei mu lan
Coelogyne annamensis Rolfe; C. dalatensis Gagnepain; C. fuscescens Lindley var. assamica (Linden & H. G. Reichenbach) Pfitzer & Kraenzlin; C. saigonensis Gagnepain; C. siamensis Rolfe; Cymbidium evrardii Guillaumin.
Pseudobulbs close together on a sturdy rhizome, spindle-shaped, 6-7 cm, 1.5-2 cm in diam. at middle, with 2 leaves. Leaf blade elliptic-lanceolate, 16-25 × 3.5-6 cm, with 3-5 veins, prominent abaxially, with petiole ca. 3 cm, barely attenuate, acute. Inflorescence proteranthous; peduncle enclosed with convolute bracts at base, 10-12 cm; rachis arching, slightly zigzag, 19-25 cm, thickened, becoming slender; flowers usually 8, opening simultaneously; floral bracts deciduous. Flowers pale yellow, more than 7 cm in diam., lip darker yellow with intricate brown veins on lateral lobes, veins on mid-lobe orange-brown. Dorsal sepal oblong, ca. 32 × 9 mm, with 7-9 branched veins, acuminate to slightly acute; lateral sepals linear, falcate, ca. 28 × 6 mm, with branched veins, acute. Petals narrowly linear, ca. 30 × 2.5 mm, with 3 branched veins; lip obovate with deep recess on each side, ca. 26 × 12 mm, conspicuously veined, 3-lobed; lateral lobes not spreading, triangular; mid-lobe somewhat orbicular, ca. 12 × 13 mm, shortly clawed, acute or subacute; callus with 3 lamellae but median lamella shorter. Column arcuate, clavate, ca. 20 mm, tip ca. 6 mm in diam., acuminate. Fl. Jan.
On trees in riverine forests; ca. 700 m. NW Yunnan [Bhutan, NE India, Laos, Myanmar, Thailand, Vietnam].