Herbs, annual, sometimes gynodioecious. Stems prostrate to erect, sparsely to densely hairy. Leaves: stipules caducous, subulate; blade reniform-round, unlobed or palmately 3-, 5-, [7-]cleft, base truncate to cordate, margins usually toothed, sometimes entire. Inflorescences axillary, solitary flowers in lower axils, congested and ± corymbose at branch tips; involucellar bractlets persistent, 3, distinct. Flowers: calyx not accrescent, not inflated, lobed to beyond middle, lobes not ribbed, acuminate; corolla campanulate, white to rose, lavender, or mauve, drying purple or blue; staminal column included; ovary 9–36-carpellate; ovules 1 per carpel; styles 9–36-branched (branches equal in number to carpels); stigmas terminal, capitate. Fruits schizocarps, oblique, not inflated, depressed-discoid, edge corrugate or reticulate, glabrous; mericarps 9–36, drying black, 1-celled, without spur, ± spheric, unarmed, lateral walls ± disintegrated, indehiscent. Seeds ascending, 1 per mericarp, black, obovoid-reniform, glabrous. x = 10.
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