光腺合欢 guang xian he huan

Trees, ca. 15 m tall. Branchlets subglabrous, with small, orbicular lenticels. Petiole and rachis glabrous; glands near base of petiole, oblong, (2.5-)5-6 mm; pinnae (2-)4-9 pairs; petio­lules absent or very short; leaflets 13-20 pairs, oblong, 1.5-3 × 0.8-1.4(-1.8) cm, both surfaces glabrous or abaxially sparsely villous, midvein slightly close to upper margin, base oblique, apex obtuse and mucronate. Heads solitary or fasciculate, ter­minal or axillary, ca. 20-flowered, arranged in panicles; pedun­cles to 15 cm. Pedicels ca. 3 mm. Calyx ca. 4 mm; teeth 1-1.5 mm, outside villous, apex acute. Corolla yellow-white, villous. Stamens ca. 3.5 mm; filaments connate into a tube at base. Ovary linear, glabrous. Legume brown, ligulate, compressed, 10-20 × 2.5-4 cm, glabrous. Seeds oblong, ca. 8 mm. Fl. Jun, fr. Dec.

● Thin forests of limestone areas; 200-300 m. Guangxi.