Herbs perennial. Stems ca. 35 cm tall, ascending, base trailing, rooting from nodes, sparsely antrorse pubescent, leafless basally; branches suberect. Petiole 5-14 mm; leaf blade narrowly ovate to narrowly triangular-ovate, 1.3-3 × 0.8-1.4 cm, herbaceous, adaxially sparsely pilose and midrib hirtellous, abaxially sometimes purplish, glabrous except hirtellous midrib and veins, base broadly cuneate to subtruncate, margin shallowly 4-6-serrate, apex acute. Racemes terminal, to 7 cm; bracts sessile, oblong, ca. 3 mm, base attenuate, margin entire, apex obtuse, lower bracts to 8 mm and margin shallowly 1-or 2-dentate. Pedicel ca. 2.5 mm, pubescent. Calyx ca. 2 mm, glandular puberulent outside; scutellum ca. 1.5 mm. Corolla reddish to purple-red, 1-1.2 cm, puberulent outside, base saccate-geniculate, white bearded, to 2.5 mm wide at throat; middle lobe of lower lip circular-ovate, ca. 3 mm wide; lateral lobes narrowly oblong, ca. 1.2 mm wide, apex rounded. Nutlets unknown. Fl. Apr-May.
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