Annual herb. Leaves simple, cauline, alternate, sessile, not decurrent. Capitula solitary, heterogamous, miniradiate; involucral bracts in several series, the inner ones longer than the outer, imbricate; receptacle flat, epaleate. Marginal florets female, fertile, ligulate. Disc florets bisexual, functionally male; corolla lobes 3, triangular; stamens 3; anthers without tails; ovary vestigial; style undivided, with obtuse sweeping hairs. Achenes terete, longitudinally ribbed; carpopodium oblique. Pappus of free, persistent, barbellate, capillary bristles, in 2 or 3 whorls.
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