Description from Flora of China
Cymbidium alborubens Makino; C. dayanum var. albiflorum S. S. Ying; C. dayanum var. austrojaponicum Tuyama; C. dayanum subsp. leachianum (H. G. Reichenbach) S. S. Ying; C. dayanum var. leachianum (H. G. Reichenbach) S. S. Ying; C. eburneum Lindley var. austrojaponicum (Tuyama) Hiroe; C. leachianum H. G. Reichenbach; C. poilanei Gagnepain; C. simonsianum King & Pantling; C. sutepense Rolfe ex Downie.
Plants epiphytic, autotrophic. Pseudobulbs nearly fusiform, ± bilaterally flattened, 2-5 × 1.5-2.5 cm, enclosed in leaf bases. Leaves 4-9, deep green, lorate, 32-60(-110) × 0.7-1.3 cm, papery, usually with 2 lateral veins raised more than midvein abaxially (especially toward base), articulate 7-12 cm from base, apex acuminate. Inflorescence arising from within sheaths at base of pseudobulb, arching or pendulous, 18-35 cm; rachis laxly 5-9-flowered; floral bracts subtriangular, 4-5 mm. Flowers usually not fragrant, 4-5 cm in diam.; pedicel and ovary 10-20 mm, elongating in fruit; sepals and petals white or cream-yellow, with a central maroon stripe extending from base to slightly above middle or occasionally wholly tinged pale purplish red; lip maroon, tinged white at its base and at center of mid-lobe, lateral lobes with dense white stripes. Sepals porrect, narrowly oblong-elliptic, 22-27 × 5-7 mm, apex acute or acuminate. Petals narrowly ovate-oblong, 17-23 × 4-6 mm, apex acute; lip subovate, 15-19 mm, not fused to basal margins of column, 3-lobed; lateral lobes nearly as long as column; mid-lobe recurved, 7-9 mm; disk densely glandular-papillose, with 2 longitudinal lamellae extending from base of lip to base of mid-lobe; lamellae continuous with 2 glandular-hairy lines that extend from apices of lamellae to middle of mid-lobe. Column slightly arcuate, 9-10 mm; pollinia 2. Capsule ellipsoid, 40-50 × 20-28 mm. Fl. Aug-Dec, fr. Feb-Apr. 2n = 40*.
Trees in open forests, cliffs along streamsides; 300-1600 m. S Fujian, Guangdong, Guangxi, Hainan, Taiwan, S Yunnan [Bhutan, Cambodia, India, Indonesia, Japan, Laos, Malaysia, Myanmar, Philippines, Thailand, Vietnam].