Description. Trees, 5 - 20 m tall. Stems arborescent, terete, inconspicuously ribbed, branches ferruginuous pubescent. Leaves 8 - 20 by 4 - 10 cm, elliptic to oblong, margin entire, apex acuminate or caudate, base cuneate or oblique, coriaceous; both surfaces puberulous with filiform hairs and capitate glands; lateral veins 10 - 15 - paired; petioles up to 3 cm long. Capitulescences terminal or axillary, thyrsoid paniculate. Capitula narrowly campanulate, shortly pedunculate. Receptacle flat, glabrous. Involucres narrowly campanulate or slightly oblong-cylindrical, in 3 - 4 series, 2 - 3 mm long. Phyllaries imbricate, green or purple, margin piliferous, outer surface puberulous without glands; the outer ovate, apex obtuse or rounded; the inner ones ovate-lanceolate or oblong, apex obtuse. Florets 3 - 6; corollas funnelform, purple to white, glandular; corolla tubes 6 - 7 mm long; corolla lobes ca. 2 mm long. Anthers ca. 2.5 mm long, apical appendage acute, base obtuse. Styles purple. Achenes turbinate, ca. 2 mm long, 3 - 4 - angled and inconspicuously ribbed, pubescent with twin hairs and capitate glands. Pappus in 2 series of bristles, the inner ones 6 - 7 mm long. Pollen subechinolophate, 3 - colporate, with micropuncta.
Sumber: Revisions and key to the Vernonieae (Compositae) of Thailand