Thrixspermum annamense (Guillaumin) Garay Bot. Mus. Leafl. 23: 206. 1972.

海台白点兰 hai tai bai dian lan

Ascochilus annamensis Guillaumin, Bull. Mus. Natl. Hist. Nat., sér. 2, 33: 333. 1961; Thrixspermum austrosinense Tang & F. T. Wang; T. devolium T. P. Lin & C. C. Hsu.

Stems 1-2 cm, 4- or 5-leaved. Leaves nearly basal, sometimes tinged with purple, narrowly oblong, 3-5 × 0.6-0.9 cm, leathery, acute and slightly bilobed. Inflorescence 6-9 cm, densely many flowered; peduncle with 2 or 3 sheaths; rachis 7-15 mm, slender, thicker distally; floral bracts persistent, ovate, ca. 1 mm, obtuse. Flowers fragrant, contiguous, opening successively, short-lived, white, small. Sepals similar, elliptic or ovate-elliptic, 5-6 × 3-3.3 mm, obtuse. Petals elliptic, ca. 5 × 3 mm, rounded; lip shallowly saccate, rhombic-triangular, ca. 5 × 6.5 mm, 3-lobed; lateral lobes erect, deltoid, rounded; mid-lobe nearly oblate, fleshy, abaxially carinate, adaxially densely hairy, slightly bilobed; disk with a longitudinal hairy callus. Column ca. 1 mm, foot ca. 1 mm. Fl. Apr-May.

Epiphytic on tree trunks in forests. S Hainan, C Taiwan [Thailand, Vietnam].