白花独蒜兰 bai hua du suan lan

Herbs, epiphytic or lithophytic. Pseudobulb ovoid-conic, 3-4.5 × 0.8-1.8 cm, with an elongated neck, 1-leaved. Leaf immature at anthesis, lanceolate, falcate, apex acute. Inflorescence erect; peduncle 3-13 cm, covered by 3 or 4 membranous sheaths except at apex; floral bracts erect, obovate, 20-35 mm, apex rounded or truncate. Flower solitary, nodding, fragrant, white, rarely with pale mauve lines on sepals and petals, lip with bold crimson, brown, or brownish yellow central stripes or tinged purple at apex; pedicel and ovary 20-30 mm. Sepals narrowly elliptic, 44-55 × 8-10 mm, apex obtuse. Petals oblanceolate, 45-55 × 8-9 mm, apex obtuse or subrounded; lip broadly ovate, 45-57 × 30-40 mm, obscurely 3-lobed, apical margin lacerate, base saccate and forming a short spur 1-2 mm; lateral lobes incurved; disk with 5 rows of long papillae in apical half of lip. Column slightly arcuate, 33-40 mm, apex without teeth. Fl. Apr-May.

On tree trunks or mossy rocks and cliffs in shaded places; 2400-3300 m. NW Yunnan [N Myanmar].