Mostly small annual or perennial herbs, glabrous or hairy; stems prostrate or erect, rarely twining. Leaves usually entire. Peduncles axillary, 1-3-flowered; bracts minute. Sepals 5, herbaceous, sub-equal or the outer ones much broader, mostly acute or acuminate. Corolla regular, small, funnel-shaped to campanulate, plicate, with subentire or angular limb, pink or white. Stamens 5; filaments adnate to the corolla, filiform; pollen ellipsoid, smooth. Ovary 2-celled, each cell with 1 ovule; style 1, simple, filiform; stigmas 4-8, rarely 2, linear. Capsule subglobose, 1-2-celled, 2-4-valved. Seeds 1 or 2, pilose or sometimes glabrous.
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