Herbs, perennial, up to 85 cm tall. Stems erect, often purplish, terete, simple, glabrous, lower part often leafless. Cauline leaves alternate, sessile; blade linear-lanceolate, 6.5-11 × 1.3-1.6 cm, both surfaces glabrous, base cuneate, margin glandular-serrate, apex acuminate. Racemes lax; flowers almost oriented toward one side; bracts conformable to leaves, 2.5-5.5 × 0.5-1 cm, longer than flowers; pedicels 5-10 mm, straight, puberulent; bracteoles 2, subulate. Hypanthium semiglobose, 2.5-4 mm, glabrous or sparsely puberulent; calyx lobes linear-lanceolate, 11-15 × 1.5-2 mm, glabrous, margin glandular-denticulate. Corolla nearly 2-lipped, purple-blue, 17-25 mm, glabrous; upper 2 lobes ascending, ca. 13 mm; lower lobes spreading, narrowly oblong, ca. 8 mm, acute. Stamens connate into tube; filament tube ca. 12 mm, glabrous; anther tube gray-blue, 5-6 mm, back sparsely setulose; lower 2 anthers barbate at top. Fl. and fr. Sep-Oct.
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