Trichosporum macranthum Merrill, Univ. Calif. Publ. Bot. 13: 141. 1926.

Stems over 40 cm, glabrous. Leaves opposite; petiole ca. 7 mm; leaf blade narrowly lanceolate to lanceolate, 10-13 X 2.4-2.8 cm, leathery, glabrous, adaxially drying smooth, abaxially not punctate, base cuneate to broadly cuneate, margin entire to indistinctly denticulate, apex attenuate; lateral veins indistinct. Cymes pseudoterminal, ca. 8-flowered; peduncle absent; bracts deciduous. Pedicel ca. 1 cm, glabrous. Calyx green, 1.2-1.5 cm, shallowly 5-lobed; tube 6.5-8 mm in diam. at mouth; lobes triangular, 2-3 X 1.5-2 mm, outside glabrous. Corolla orange-red, ca. 5.2 cm, outside sparsely puberulent apically, inside sparsely pubescent basally, without tufts of hairs, mouth not oblique; limb indistinctly 2-lipped; adaxial lip ca. 6 mm; abaxial lip ca. 5.5 mm. Stamens exserted; filaments 2.3-3.2 cm; anthers coherent in pairs at apex, 1.2-2 mm; staminode ca. 5 mm. Pistil ca. 3 cm; ovary glabrous. Style ca. 1.8 cm, puberulent. Capsule 19-29 cm. Seeds with 1 hairlike appendage at each end, appendages ca. 1 cm. Fl. Jun.

On trees of forest margins in valleys; ca. 800 m. SE Yunnan [Laos, Thailand, N Vietnam].