Herbs, perennial, up to 1.5 m tall, simple. Stems erect, terete, sparsely to densely puberulent toward apex. Leaves sessile; blade elliptic, narrowly elliptic, narrowly oblong, or lanceolate, 5.5-16 × 1.2-3 cm, both surfaces glabrous, base cuneate, margin glandular-serrulate or-crenulate, apex acuminate. Flowers solitary in axils of little-reduced or unreduced leaves, and uppermost 10-25 often aggregated into a terminal raceme; pedicels 12-38 mm, densely puberulent. Hypanthium obconic or campanulate, 3-5(-7) mm, puberulent on veins or sometimes glabrous; calyx lobes erect, narrowly triangular or triangular, 3-7 mm, glabrous, margin entire or with 1-3 teeth per side. Corolla red-purple or greenish with lip purple spotted, 18-23 mm, both sides sparsely pubescent; dorsal lobes linear or linear-triangular; ventral lobes lanceolate, acuminate. Filament tube glabrous, ca. 2 × as long as anther tube; anther tube gray, 5-6 mm, glabrous; ventral anthers barbate at apex with white hairs ca. 1 mm or smaller. Berry dry, globose or obovoid, 7-17 mm. Seeds amber-colored, dull, broadly ellipsoid, 0.6-0.7 × 0.3-0.4 mm, subterete. Fl. and fr. Aug-Sep.
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