Koelreuteria minor Hemsley, Hooker’s Icon. Pl. 27: t. 2642. 1900; Sinoradlkofera minor (Hemsley) F. G. Meyer.

Trees small, 2-15 m tall. Bark dark brown, fissured; branches pubescent. Leaves fascicled at branch apices, paripinnate, 9-12 cm; petiole 1-2 cm, slender, pubescent with axis; leaflets 10-20; petiolules ca. 1 mm; blades lanceolate or elliptic, 2-3(-4) × 1-1.5 cm, papery, glabrous except pubescent on midvein, base oblique, one side cuneate, other side rounded or obtuse, margin obtusely serrate, apex obtuse. Thyrses terminal,
rarely axillary, nearly as long as leaves, pubescent; branches spreading. Flowers pale yellow to nearly white; buds globose, ca. 1.5 mm in diam. Pedicels 2-3 mm, pubescent. Sepals 5; upper 4 oblong, ca. 2.2 mm; lower 1 suborbicular, ca. 1.6 mm, white pubescent, margin ciliate. Petals oblong, ca. 2.4 mm, pinnately veined, abaxially white pilose, adaxially glabrous. Stamens 8; filaments ca. 4 mm. Ovary 3-furrowed and ridged, hairy. Capsules subglobose in outline, 3-winged, 1.8-2.3 cm (including wings) in diam., apex concave and with persistent style. Seeds ca. 4 mm in diam. Fl. May-Jun, fr. Jul-Aug.

This species is used for its timber.

● Limestone mountains. Guangdong, Guangxi, Guizhou, Hunan, Yunnan.