Plants perennial. Stem solitary, rarely branched, erect, to 1 m, tawny pubescent, retrorse pilose toward base, densely glandular pilose and villous toward apex. Stem leaves odd-pinnate, leaflets (3-)5-7; petiole 5-15 cm, petiolule of terminal leaflet 0.8-3 cm; terminal leaflet ± ovate-lanceolate, 3-13 × 1.5-5 cm, margin irregularly crenate; lateral leaflets elliptic-lanceolate, 2-12 × 0.8-4.5 cm. Inflorescences densely glandular pilose, villous; verticillasters 6-12-flowered. Pedicel 2-8 mm. Calyx tubular, 6-13 mm, densely glandular pilose, villous, throat white hirsute; upper lip broadly triangular, 1.5-3 × 4-6 mm, apex acute; lower lip as long as upper, teeth narrowly triangular. Corolla yellow or yellowish, 2-2.8 cm, pubescent; tube obliquely pilose annulate, white pilose at throat, 0.8-1.5 cm, gradually dilated apically; upper lip falcate; lower lip shorter, middle lobe flabellate, 1.5-3 × 4-6 mm, constricted at base, margin irregularly dentate; lateral lobes 1-2 × 2-3 mm. Filaments 3-5 mm; connectives slightly curved, 2-2.5 mm, upper arms 1-1.7 mm, lower arms 0.5-1.2 mm; lower anther cells sterile, apex united. Nutlets yellow-brown, ellipsoid, 0.8-1.2 mm, ca. 0.5 mm in diam. Fl. and fr. May-Jun.
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