Sterculia hainanensis Merr. & Chun

Small trees or shrubs. Branchlets glabrous or minutely stellate puberulent when young. Petiole 1.5-2.5 cm; leaf blade oblong or linear-lanceolate, 15-23 × 2.5-6 cm, abaxially and adaxially glabrous, lateral veins 13-18 on each side of midrib,
curved and connected far from margin, base acute or obtuse, apex obtuse or nearly acuminate. Inflorescence racemose, terminal. Male flowers: calyx red, ca. 8 mm, divided nearly to base, abaxially sparsely stellate pilose, lobes oblong or oblong-elliptic, ca. 6 mm. Androgynophore curved. Anthers ca. 8 in circle. Female flowers slightly larger, ca. 10 mm. Ovary globose; style curved. Follicle red, narrowly ellipsoid, ca. 4 cm, abaxially densely velutinous, apical beak ca. 6 mm. Seeds black-brown, ellipsoid, ca. 1 cm. Fl. Jan-Apr.

● Valleys and gullies in dense forests. S Guangxi, E Hainan.