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DescriptionPerennial plants. Stems scandent, young branches terete, pubescent or glabrous. Leaves simple, alternate, petiolate, pubescent with uniseriate hairs; lamina ovate, lanceolate or elliptic; margin entire, apex acute or acuminate, base cuneate, subcoriaceous. Capitulescences terminal or axillary. Capitula discoid, homogamous, pedunculate, florets bisexual and fertile. Involucre campanulate, in 4–6-series. Phyllaries imbricate, 7–12 mm long, persistent, lacking glands. Corollas funnelform, purple or white, actinomorphic, corolla basal tubes slender, closely investing style shaft; corolla lobes 5. Anthers 5, syngenesious. Styles 2-branched, inner surface covered with stigmatic papillae, outer surface covered with sweeping hairs on the outer surface reaching below style bifurcation. Achenes clavate or turbinate, 10-ribbed, hairy, without glands, carpopodium present. Pappus in 2 series of bristles. Pollen subechinolophate, 3-colporate, with micropuncta. Three species are recognized in Thailand.