Herbs or subshrubs, with cystoliths. Leaf blade margin entire. Inflorescences terminal or axillary, panicles, racemes, or sometimes spikes or dense clusters; bracts present; bracteoles small [or absent]. Calyx deeply 5-lobed; lobes narrow, equal or subequal. Corolla tubular to funnelform at base; limb 2-liped; lower lip 3-lobed; upper lip entire or 2-lobed; lobes ascending cochlear in bud. Stamens 2, exserted from or included in corolla tube; filaments sometimes pubescent; anthers 2-thecous; thecae parallel, equal or subequal, base muticous and conspicuously pubescent. Capsule linear-oblong or ellipsoid, compressed perpendicular to septum, [6-]12-20-seeded; retinacula present. Seeds subglobose, ± blocky, or ± compressed, surfaces smooth or ornamented, lacking trichomes.
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