花 Leaf blade elliptic-lanceolate, 10-26 × 5-8 cm, leathery, acuminate; petiole ca. 5 cm. Inflorescence hysteranthous; peduncle green, 5-15 cm, slender, glabrous; rachis zigzag, 10-20 cm; flowers 6-18, opening in succession; imbricate sterile bracts at interface between peduncle and rachis. Flowers light brownish, ca. 2.5 cm in diam. Sepals broadly oblong, 10-13 × ca. 6 mm, glabrous, 3-veined, acuminate. Petals 10-13 × ca. 1 mm, very slender, glabrous, 1-veined, obtuse; lip 3-lobed; lateral lobes rounded with broad crenulations; mid-lobe narrowly truncate at base, entire, undulate, recurved; callus with 5 prominent, short lamellae, outer ones broader. Column ca. 5 mm, hood narrowly winged with wings serrate. Capsule ellipsoid, ca. 3.5 × 1.5 cm. Fl. Apr, Jun-Aug.序长5.0一15.0 cm，先于叶发出，花序轴呈之字形弯曲，具6一18朵花，花淡黄色。萼片宽长圆形，长10.0一13.0 mm，宽6.0   mm;花瓣长10.0一13.0 mm,宽1.0 mm;唇瓣3裂，侧裂片圆形，边缘具皱褶，中裂片基部截形，全缘，内弯;唇盘上具5条褶片，最外1条较宽;蕊柱长5.0 mm。

花期：4月。