Herbs 35-50 cm tall. Stems 15-30 cm, sparsely glandular pubescent upward. Leaves ovate-lanceolate or lanceolate, 2-2.5 cm X 4-6 mm, glabrous adaxially, glandular pubescent at margin and abaxially. Inflorescences spicate, 10-20 cm; bract ovate-lanceolate, 2-3 cm X 4-5 mm, along with calyx densely glandular pubescent; bractlets absent. Calyx 1-1.2 cm, irregularly 2-parted; segments lanceolate, entire or 2-lobed; lobes linear-lanceolate, unequal, 4-8 mm, usually 3-veined, apex long acuminate. Corolla yellow, 2-3.5 cm; tube not constricted, distinctly enlarged upward; upper lip slightly emarginate or mucronate; lobes subrounded, unequal, glandular pubescent at margin and on both sides, margin irregularly dentate or sinuolate. Filaments 1.2-1.4 cm, white villous proximally, glabrescent distally; anthers oblong, 1.8-2 mm, white pubescent. Pistil ca. 1.6 cm; ovary narrowly ellipsoid. Style ca. 1 cm, glandular pubescent; stigma 2-lobed, lobes globose, ca. 1 mm in diam. Capsule oblong, 1-1.2 cm. Seeds oblong, 0.4-0.5 X ca. 0.3 mm. Fl. May-Jul, fr. Jul-Sep. 2n = 38.
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