1. Panisea tricallosa Rolfe, Bull. Misc. Inform. Kew. 1901: 148. 1901.
曲唇兰 qu chun lan
Panisea bia (Kerr) Tang & F. T. Wang; P. pantlingii (Pfitzer) Schlechter; P. unifolia S. C. Chen; Sigmatogyne bia Kerr; S. pantlingii Pfitzer; S. tricallosa (Rolfe) Pfitzer.
Rhizome 2-3 mm in diam., branched, rooting on nodes, with membranous sheaths. Pseudobulbs rather dense, often tufted, erect or suberect, brown when dry, narrowly ovoid or subellipsoid, 7-20 × 4-10 mm, wrinkled when dry, base conspicuously contracted, apex 1- or 2-leaved. Leaf blade narrowly elliptic or suboblong, 3-6 × (0.5-)0.8-2.3 cm, acute or obtuse; petiole 4-13 cm. Inflorescence proteranthous, 1-flowered; peduncle 2-3 cm; floral bracts ovate, 3-5 mm, scarious. Flowers pale yellow or greenish, 2-2.5 cm in diam., lip with 3 small spots at base, calli on disk orange, column pale yellow; pedicel and ovary ca. 1 cm. Sepals narrowly ovate, oblong-ovate, or broadly lanceolate, 12-19 × ca. 5 mm, dorsally carinate, 5-veined, acuminate; lateral sepals slightly oblique. Petals ovate-oblong or nearly broadly lanceolate, 13-18 × ca. 4 mm, 3-veined, acute to acuminate; lip obovate-oblong to spatulate, 10-20 × 6-7 mm, sigmoid at base, entire, inconspicuously undulate, truncate, apiculate, or subrounded; disk with 2 or 3 short longitudinal lamellae. Column 5-7 mm, both sides winged; wings very narrow in lower part, upper part 1-1.5 mm wide on one side, apex surrounding column and irregularly incised; foot inconspicuous. Capsule subobovoid-ellipsoid, hexagonal, ca. 2 × 1-1.3 cm, each ridge with a wing ca. 1.5 mm wide. Fl. Dec, fr. next May-Jun. 2n = 40.
Epiphytic on tree trunks in forests; below 2100 m. Hainan, S and SW Yunnan [Bhutan, NE India, Laos, Nepal, Thailand, Vietnam].