Herbs perennial. Stems to 55 cm tall, erect, base to 2.5 mm in diam., densely white floccose-pilose, unbranched or apical axils with short fertile branches, internodes longer than leaves. Leaves 4-paired, basal leaves smaller; petiole 0.8-2.5 cm; leaf blade triangular to ovate, mostly 2.2-6 × 1.7-6 cm, ± membranous to herbaceous, densely white floccose-pilose, abaxially intermixed with yellowish glands, base shallowly cordate to truncate, margin coarsely undulate-crenate, apex rounded to subacute. Racemes terminal, 3-16 cm; bracts sessile, oblong, 4-6 × 1.5-2 mm, base attenuate, apex obtuse, ciliate. Pedicel ca. 2.5 mm, densely white pilose. Calyx ca. 2.5 mm, to 5 mm in fruit, sparsely fine pilose; scutellum semicircular, spreading, ca. 2 mm, erect, to 5 mm in fruit. Corolla yellowish when dry, 1.4-1.6 cm, sparsely glandular puberulent outside, subglabrous inside; tube straight, bent at base, to 3.5 mm wide at throat; middle lobe of lower lip triangular-ovate, to 5 mm wide, apex emarginate; lateral lobes ovate, ca. 2 mm wide. Nutlets brownish, ovoid, ca. 0.75 × 0.5 mm, tuberculate, adaxially umbonate at middle.
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