Annual or perennial herbs or undershrubs. Leaves opposite or whorled, sessile or petiolate, simple, entire to coarsely serrate. Inflorescence monocephalic to loosely corymbose. Capitula homogamous, campanulate; involucral bracts herbaceous, 15–25, unequal, in 3–5 indistinct series, imbricate, free to base, deciduous; receptacle conical to ellipsoid, naked. Disc florets bisexual; corolla narrowly funnelform or with cylindrical throat and slightly narrower basal tube, 5-lobed, mostly smooth on outer surface with a few glands, white, blue or lavender; outer lobes of marginal flowers not expanded. Achenes ± flattened, 3-or 4-ribbed, sparsely hairy. Pappus of up to 40 scabrid bristles in 1 series, persistent.
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