Subshrubs or herbs, perennial, epipetric or terrestrial, rhizomatous, sometimes stoloniferous, stemmed or seldom stemless. Leaves few to many, on stem and alternate, crowded near stem apex or basal; leaf blade puberulent to densely woolly or glabrescent, base cuneate to attenuate. Inflorescences lax, sometimes umbel-like, axillary, 1-to many-flowered cymes; bracts 2 and opposite, rarely several and whorled. Calyx actinomorphic, 5-sect from base; segments equal. Corolla white to pink or blue to purple, zygomorphic, inside glabrous or puberulent; tube campanulate, not swollen, sometimes saccate at base, slightly shorter than limb, 3-7 mm in diam.; limb slightly 2-lipped; adaxial lip 2-lobed, slightly shorter than to as long as abaxial lip; abaxial lip 3-lobed, lobes equal or subequal, apex rounded to acute. Stamens 4, adnate to corolla near base, included; anthers basifixed, free, thecae subparallel, confluent at apex, dehiscing longitudinally, poricidally, or transversely; connective not projecting; staminode 1, adnate to adaxial side of corolla tube. Disc ringlike or inconspicuous. Ovary ovoid or conical, 1-loculed; placentas 2, parietal, projecting inward, 2-cleft. Stigma 1, terminal, capitate, undivided. Capsule straight in relation to pedicel, linear to narrowly oblong, much longer than calyx, dehiscing loculicidally to base; valves 2, straight, not twisted. Seeds unappendaged.
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