Herbs, (13-)30-60 cm tall; stems, leaf blades, bracts, and calyces setiferous. Stems erect, basally subterete, channeled, usually branched at or above middle. Leaves opposite, rarely alternate, sessile, linear-lanceolate, 2-3 cm X 3-4 mm, margin entire and subrevolute, midrib abaxially bulging. Bracts shorter or rarely as long as corolla. Flowers borne above middle of stem. Calyx 7-15 X 4-6 mm, densely hispid, apex constricted, slightly curved; lobes reduced to 3 mucros. Corolla yellow, purple-red, or white with purple lobes, 1.5-4 cm; lower lip lobes 3, orbicular; upper lip lobes 2, orbicular. Anterior stamens ca. 1 cm; posterior stamens 6-7 mm; filaments all woolly. Ovary glabrous. Stigma linear-elliptic, ca. 3 X 1 mm, hairy. Capsule ovoid, ca. 8 X 4 mm, apex mucronate. Seeds yellow, small, spirally striate. Fl. and fr. Jul-Oct.
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