Herbs annual. Stems 3-23(-30) cm tall, erect, white villous, unbranched. Petiole 0.7-2 cm, narrowly winged, greenish white, sometimes red or greenish purple; leaf blade (3-)4-8 × (1.5-)2.2-7 cm, sparsely strigose, base cuneate-decurrent, margin undulate to irregularly crenate, ciliate, apex obtuse to rounded. Inflorescences terminal, subcapitate, 2-3 cm, of 3 or 4 verticillasters; basal floral leaves green, red, or blue, shaded purplish, ovate to elliptic, 1.5-4.5 cm, crenate to entire, ciliate. Calyx tubular-campanulate, 5-8 mm, glabrous or ciliate on margin; teeth narrowly triangular to linear-lanceolate, to 1/2 as long as calyx. Corolla red-purple to blue, tubular, slightly curved, 1.5-3 cm, pilose, villous annulate inside; upper lip 2-lobed, with circular and equal lobes; lower lip with flabellate middle lobe slightly larger than circular lateral lobes. Fl. Jun-Aug, fr. Sep.
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