Herbs, often prostrate then ascending, rarely erect, with cystoliths, isophyllous. Leaves petiolate or subsessile; leaf blade margin entire. Inflorescences terminal thyrsoid racemes or thyrses, sometimes with many-flowered cymes proximally and 1-3-flowered cymes distally; bracts small; bracteoles smaller than bracts. Calyx usually deeply 5-lobed; lobes subequal or slightly unequal, posterior one sometimes shorter. Corolla white, greenish, or yellowish; tube straight or curved, sometimes with a dorsal pouch; throat short or absent; limb 2-lipped; lower lip 3-lobed; upper lip emarginate or 2-lobed [or entire]; lobes ascending cochlear in bud. Stamens 2, inserted at throat; anthers 2-thecous; thecae equal or subequal, parallel, muticous at base; staminodes 2, inserted at base of upper lip. Stigma 2-cleft. Capsule stalked, 4-seeded; retinacula present.
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