Sterculia lanceolata Cavanilles var. principis (Gagnepain) Phengklai.

Shrubs. Branchlets at first stellate pubescent. Stipules triangular, 7-10 mm; petiole 4-6 cm, with black-brown spots; leaf blade elliptic or linear-elliptic, 16-28 × 4-8.5 cm, both surfaces glabrous or very sparsely stellate pilose abaxially, basal veins 5, lateral veins 7-10 on each side of midrib, base nearly rounded, apex long acuminate. Inflorescence racemose or few-branched paniculate, axillary, flowers lax. Calyx divided nearly to base, 10-12 mm, abaxially minutely pilose, adaxially glabrous, lobes linear-lanceolate, margins ciliate, apex long acuminate, incurved and cohering apically with each other. Male flowers: androgynophore glabrous, curved. Female flowers: androgynophore very short, hairy. Style minutely hairy; stigma 5-lobed. Fruit not seen. Fl. Mar.

Forests on slopes; 1600-1700 m. SE Yunnan (Jinping) [Laos, Myanmar, Thailand].