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Annual or perennial herbs, pubescent with glandular or simple, non-glandular hairs. Leaves alternate, simple, entire or toothed or lobed, petiolate or sessile. Inflorescence a dense unilateral spike. Flowers bisexual, slightly zygomorphic, each subtended by a leafy bract. Calyx tubular-campanulate, 5–lobed, enlarging in fruit. Corolla broadly funnel-shaped, yellowish; limb 5–lobed, the lobes folded in bud. Stamens 5, subequal, inserted near base of corolla-tube; anthers bilocular, basifixed, dehiscing by longitudinal slits. Ovary bilocular; stigma capitate. Fruit a capsule, smooth or nearly so, opening by an apical lid, enclosed in enlarged calyx. Seeds reniform to orbicular.
Unarmed annual, biennial and perennial herbs, ± hairy, often viscid. Lvs alternate, simple, entire to pinnatisect, sessile or petiolate. Fls in bracteate spikes or racemes. Calyx campanulate proximally, tubular distally, strongly veined, accrescent; teeth 5, regular, becoming spiny at fruiting. Corolla ± broad-funnelform, dingy purple, yellowish or whitish; lobes 5, patent, emarginate to obtuse, sometimes somewhat zygomorphic. Stamens 5, inserted at base of corolla, usually slightly exserted. Stigma capitate. Capsule circumscissile, enclosed in swollen campanulate 1/2 of calyx. Seeds numerous, small.
