Description. Annual herbs, 20 - 100 cm tall. Stems erect, conspicuously ribbed, sericeous. Leaves 3 - 5 by 2 - 3 cm, lanceolate or ovate to broadly ovate, margin undulate to serrate, apex acute to acuminate, base attenuate, chartaceous; upper surface sericeous without glands; lower surface sericeous with cylindrical hairs, T-shaped hairs and capitate glands, lateral veins 5 - 7 - paired; petioles up to 2 cm long. Capitulescences terminal or axillary, paniculate. Capitula campanulate, 5 - 6 mm long, pedunculate. Receptacle flat, 2 - 2.5 mm in diam., glabrous. Involucres campanulate, in 3 - 4 series, 4 - 4.5 mm long, 2.5 - 3 mm in diam. Phyllaries imbricate, green with purple apex, margin piliferous, outer surface sericeous glandular; the outer and the middle ones lanceolate, apex acute to acuminate; the inner ones lanceolate to oblong, apex acuminate. Florets 25 - 30; corollas funnelform, purple or white, puberulous glandular; corolla tubes 3 - 3.5 mm long; corolla lobes ca. 1 mm long. Anthers ca. 0.6 mm long, apical appendage acute, base obtuse. Styles purple, ca. 3 mm long, branches ca. 0.5 mm long. Achenes clavate, 1.5 - 1.8 mm long, ribs inconspicuous, densely pubescent with twin hairs and capitate glands. Pappus in 2 series of bristles, the inner ones 3 - 3.5 mm long, persistent.
Sumber: Revisions and key to the Vernonieae (Compositae) of Thailand