3. Albizia attopeuensis (Pierre) I. C. Nielsen var. laui (Merrill) I. C. Nielsen, Adansonia, n.s. 19: 210. 1979.
海南合欢 hai nan he huan
Albizia laui Merrill, Lingnan Sci. J. 14: 7. 1935.
Trees, deciduous, ca. 10 m tall. Branchlets conspicuously lenticellate. Stipules inconspicuous; pinnae 1 pair, 10-15 cm; glands at junction of pinnae and leaflets; petiolules 5-7 mm, shortly tomentose; leaflets 2-4 pairs, rarely 1 pair, oblong or narrowly ovate, 5-10 × 2.5-5.5 cm, leathery or subleathery, abaxially puberulent on veins, main vein central, net veins raised on both surfaces, base subrounded to broadly cuneate, slightly asymmetric. Heads several to more than 10-flowered, arranged in panicles, ferruginous pubescent; peduncles 5-25 mm. Flowers dimorphic, yellowish, fragrant. Calyx tubular, 2-2.5 mm; teeth ovate-deltoid, outside densely pubescent. Corolla funnel-shaped, 8-10 mm; lobes oblong. Stamens 30-40; filaments ca. 3 cm, staminal tube shorter than corolla tube. Ovary linear, ca. 3.5 mm, sessile, glabrous. Legume oblong, compressed, 10-15 × 3-4 cm, glabrous, indehiscent. Seeds 9-12, black-brown, ellipsoidal; pleurogram shortly U-shaped. Fl. Feb-Jun, fr. Jun-Oct.
● Forests; 200-300 m. Hainan.
Albizia attopeuensis var. attopeuensis (Pithecellobium attopeuense Pierre) occurs in Laos, Thailand, and Vietnam.