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Herbs, perennial, up to 2 m tall. Stems erect, arching, or sprawling, terete, commonly branched from base and sometimes above, upper internodes zigzag, glabrous (rarely sparsely scabrous, or puberulent when young). Leaves petiolate; blade elliptic, ovate, or lanceolate, 3.5-13 × 1.2-4.6 cm, papery, glabrous (rarely puberulent when young, or sparsely scabrous on midrib), base cuneate, obtuse, or rounded, margin glandular-serrulate,-denticulate, or-crenulate, apex caudate or sometimes merely acuminate; petiole 0.3-1.3 cm. Flowers solitary and axillary; pedicels slender, 24-55 mm, glabrous. Hypanthium globose or campanulate (rarely obconic), 3-6 mm, glabrous; calyx lobes spreading, recurved, or rarely reflexed, linear-triangular or linear, 2-14 mm, margin entire. Corolla dark violet to bluish lilac, lip often paler, or striped, margined, or blotched with white, 15-26 mm, outside glabrous, inside villous; dorsal lobes linear; ventral lobes elliptic, apex caudate. Filament tube glabrous, up to 2.5 × as long as anther tube; anther tube light gray, 4.8-7 mm, dorsal surface sparsely shortly pubescent at least toward apex; lower 2 anthers barbate at apex with tufts of white hairs up to 2 mm. Berry violet to black-purple, globose, 6-15 mm. Seeds amber-colored, shiny, broadly ellipsoid, slightly compressed, 0.5-0.8 × 0.3-0.5 mm. Fl. Jul-Nov, fr. Aug-Apr.
