Herbs perennial. Stems erect, 25-60 cm tall, angles slightly winged, glabrous except nodes sometimes puberulent, much branched. Petiole 1-3 mm, glabrous; leaf blade ovate to lanceolate, 2-7 × 1.3-3 cm, papery, glabrous, base broadly cuneate to roundish, margin remotely undulate-denticulate, apex caudate-acuminate. Racemes terminal or abruptly reflexed and axillary; rachis puberulent; bracts conspicuous, ovate to lanceolate, 3-8 mm, glabrous, margin entire. Pedicel ca. 3 mm, puberulent, sometimes also pubescent. Calyx ca. 3 mm, finely puberulent outside, to 5 mm in fruit; scutellum ca. 1.5 mm, to 4.5 mm in fruit. Corolla cream yellow to white, ca. 2.3 cm, sparsely glandular pubescent outside, glabrous inside; tube base saccate, throat to 6 mm wide; middle lobe of lower lip triangular-ovate, to 8 mm wide at base, apex emarginate; lateral lobes narrowly triangular. Nutlets black, ovoid, ca. 1 mm in diam., tuberculate, adaxially umbonate on base. Fl. Apr-May, fr. May-Jun.
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