Oreorchis bilamellata Fukuyama Bot. Mag. (Tokyo). 48: 436. 1934.

大霸山兰 da ba shan lan

Tainia bilamellata (Fukuyama) S. S. Ying.

Plants to 50 cm tall. Pseudobulbs ovoid or globose, 2-3 × 0.7-2 cm, 2- or 3-noded, persisting and forming a chain of pseudobulbs connected by a short rhizome. Leaf solitary, linear, plicate, 20-40 × 1-2 cm, gradually tapering at base into an indistinct petiole-like stalk, apex acute. Inflorescence ca. 50 cm, with 3 or 4 sheaths; rachis ca. 14 cm, laxly 15-20-flowered; floral bracts lanceolate, ca. 5 mm. Flowers brownish yellow, sepals with dark purple striations, lip yellow or whitish with dark purple spots on mid-lobe; pedicel and ovary brown, ca. 9 mm. Sepals lanceolate, 8-9 × 1.5-3 mm. Petals narrowly oblong, slightly falcate, 7-8 × 1-1.5 mm, apex acute; lip oblong-obovate, 6-7 × ca. 3 mm, base saccate, 3-lobed near middle; lateral lobes erect and loosely embracing column, linear, falcate, ca. 5 × 0.6 mm, apex obtuse; mid-lobe reflexed, oblong, 3.8-5 × 3-3.2 mm, margin undulate, apex subtruncate; disk with a yellow, longitudinally channeled, fleshy callus between lateral lobes and extending onto mid-lobe; callus ca. 3 mm. Column ca. 4 mm, slightly dilated at base. Fl. May-Jun.

● Humid and shaded places in forests; 2000-3000 m. C and S Taiwan.