Nauclea sessilifolia Roxburgh, Fl. Ind. 2: 124. 1824; Adina sessilifolia (Roxburgh) J. D. Hooker ex Brandis; N. sericea Wallich ex G. Don.

Trees, leaf persistence unknown, 7-30 m tall; bark dark gray, transversely fissured and cracked, with inner bark brown, sometimes mottled; branches flattened to angled, glabrous. Leaves sessile or subsessile; petiole to 5 mm, stout, glabrous; blade drying papery to thinly leathery, elliptic to elliptic-oblong or suborbicular, 5-30 × 3-15 cm, both surfaces glabrous, base rounded to truncate or cordulate, apex obtuse; secondary veins 6-9 pairs, with small, glabrous to pilosulous, foveolate domatia in abaxial axils of lateral, tertiary, and often quaternary veins; stipules broadly elliptic to obovate, 10-30 × 5-10 mm, glabrous, keeled in lower portion, apex obtuse to broadly rounded. Inflorescences glabrescent; peduncles 1(or 3), 1-3(-8) cm; flowering heads solitary, 20-25 mm in diam. across calyces, 35-45 mm in diam. across corollas; involucral bracts not seen; bracteoles linear, 1-2(-3) mm. Calyx with ovary portion obconic, 1-1.5 mm, glabrous or apically tomentulose; limb partially lobed, with basal tubular portion 0.5-0.8 mm; lobes densely pilosulous, with shaft clavate, 5-7 mm, with apical portion pyramidal, deciduous before corollas open. Corolla color unknown; tube 5-6 mm, inside glabrescent; lobes deltoid to elliptic, 2-3 mm, outside densely strigillose to sericeous, acute. Stigma subglobose, ca. 0.8 mm, exserted for 5-6 mm. Fruiting heads (15-) 25-35 mm in diam. Capsules obconic, 8-10 mm, glabrous except densely pilosulous at apex; seeds ca. 2 mm. Fl. Oct.

This is the first report of this species in Taiwan.

Thickets or broad-leaved forests on hills; 500-800 m. Taiwan, Yunnan [Cambodia, India, Laos, Myanmar, Thailand, Vietnam].