Herbs annual or biennial. Stems erect, 30-90 cm, much branched, densely viscid-hirsute. Petiole 2-6 cm, gradually shorter toward stem apex; leaf blade hastate to hastate-triangular, 3-8 × 2.5-5.5 cm, strigose, abaxially yellowish glandular, base shallowly cordate to truncate, margin crenate, apex acute to obtuse. Verticillasters 4-6-flowered, in terminal and axillary racemes, widely spaced at base; upper bracts lanceolate to ovate, 0.5-1.5 cm, glandular villous, intermixed with yellow-brown glands, margin undulate or entire. Pedicel ca. 3 mm. Calyx campanulate, 6-8 mm in flower, dilated after anthesis, hirsute, glandular pubescent, intermixed with yellowish brown glands, 2-lipped to 1/3 its length; upper lip triangular-semicircular, ca. 3.5 × 5 mm, apex 3-mucronate; lower lip nearly as long as adaxial, teeth triangular, apical spine ca. 1 mm. Corolla yellow, 1-1.3(-1.6) cm, pilose or subglabrous; tube imperfectly pilose annulate inside, somewhat exserted, slightly constricted below middle, exserted part dilated, to ca. 5 mm wide at throat; upper lip straight, oblong, ca. 4.5 × 2.7 mm, margin entire; lower lip longer than upper, ca. 3.5 × 7 mm; middle lobe obcordate, ca. 1.5 × 3 mm. Filaments ca. 4 mm; connectives arcuate, ca. 4 mm, arms subequal. Nutlets obovoid, ca. 2.8 × 1.9 mm, dark brown. Fl. Jun-Aug, fr. Sep-Oct.
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