凹叶红豆 ao ye hong dou

Layia emarginata Hooker & Arnott, Bot. Beechey Voy. 183. 1833; Fedorovia emarginata (Hooker & Arnott) Yakovlev; Macrotropis emarginata (Hooker & Arnott) Walpers.

Trees evergreen, small, 6(-12) m, 8(-30) cm d.b.h., some­times shrubs; bark of young trees greenish, becoming grayish green. Branchlets green, smooth, glabrous, lenticels inconspic­uous; buds rusty brown pubescent. Leaves imparipinnate, (6.5-)11-20.5 cm; petiole (2.3-)3.4-4.8 cm; rachis (2.3-)4-8.6 cm, not prolonged or prolonged 1.2-2 cm below terminal leaflet, young petiole, rachis, and leaves abaxially sparsely appressed yellowish brown pilose, becoming glabrescent, both petiole and rachis grooved; leaflets (3-)5-7; petiolule 3-5 mm, stout, grooved, wrinkled; blades obovate, obovate-elliptic, long-obovate, or oblong, (1.4-)3.7-7 × (0.9-)1.6-3.2 cm, thickly leathery, base cuneate or rounded, apex obtuse, emarginate; lateral veins 7 or 8 pairs, fine, angled 45° with midvein, veinlets fine, raised, more conspicuous abaxially. Panicles terminal, 10-11.5 cm, few flowered. Flowers fragrant; pedicel 3-5 mm, glabrous. Calyx broadly campanulate, flared out and appearing flat-faced; teeth isometric, margin and inner surface gray to­mentose. Corolla white or pink; standard semiorbicular, ca. 7 × 8 mm, apex rounded, claw ca. 2 mm; wings oblong, base au­riculate, claw 2.5-3 mm; keel oblong, somewhat curved, slightly auriculate, claw ca. 2.5 mm. Stamens unequal. Ovary glabrous. Legumes dark brown or black, compressed, rhombic or oblong, 3-5.5 × 1.7-2.4 cm, apiculate, stipe 2-3 mm; valves woody, septate. Seeds 1-4, red-brown, suborbicular or elliptic, slightly compressed, 7-10 × ca. 7 mm; hilum whitish yellow, small, ca. 2 mm. Fl. May-Jun, fr. Aug-Oct.

Mountain slopes, mixed valley forests. Guangdong, S Guangxi (Dongxing), Hainan [Vietnam].