单叶红豆 dan ye hong dou

Fedorovia simplicifolia (Merrill & Chun) Yakovlev.

Shrubs or small trees, 2-5 m. Branches glabrous; buds tri­angular-ovoid, densely appressed brownish tomentose. Leaves simple, alternate or sometimes subopposite at apex; stipules ab­sent; petiole 4-8 mm, with short hairs; leaf blade oblong or lanceolate, 4.7-25 × 1.4-6 cm, leathery, sparsely appressed red­dish brown hirtellous abaxially, glabrous adaxially, base cune­ate or rounded, apex long caudate, sometimes retuse; lateral veins 8-10 pairs, inconspicuous. Inflorescence paniculate or racemose, terminal or in upper axils, 6-10 cm, grayish brown pubescent or glabrescent. Flowers 1.2-1.5 cm, fragrant; pedicel thin, 0.7-1 cm, appressed yellowish gray pubescent. Calyx appressed short yellowish gray hairy; teeth triangular, blunt, slightly longer than calyx tube. Corolla rose-pink; standard broadly ovate, ca. 1.5 cm wide, base broadly truncate to rounded, apex retuse, claw 1.8-2 mm; wings and keel oblong to oblanceolate, 1.2-1.4 × ca. 0.5 cm, claw ca. 4 mm. Stamens unequal, 8-15 mm. Ovary glabrous; ovules 4. Legumes com­pressed, oblong or obovate, 3-4.5(-6) × 2-2.5 cm; valves nearly woody, ca. 2 mm thick, internal septum absent. Seeds 1-3, red, elliptic, ca. 1.5 × 1.2 × 0.6 cm, glossy; hilum small, aril absent. Fl. Jul, fr. Sep-Oct.

● Valley forests; 400-1300 m. Guangxi, Hainan.