Herbs, sometimes suffrutescent, erect, to 1.0 mn tall; stem quadrangular, sharply angled or slightly winged, wooly to villous when young. Leaves elliptic, 8-15 cm long, 3-5 cm wide, apically acuminate, basally attenuate, glabrous, darker above, often purplish, green beneath, the margins entire to slightly un-dulate; petiole 1-4 cm long. Inflorescences in axillary cymes, the peduncle to 18 cm long; pedicels ca. 2 mm long, white to purplish; bracts and bractlets small, ca. 5 mm long, lanceolate to spatulate. Flowuers with the calyx and the pedicel covered with glandular hairs, 4-6 mm long; corolla to 2.5 cm long, the lower portion of tube 1 mm wide, 5 mm wide at the throat, the lobes rounded, ca. 5 mm wide, puberulent outside, villous inside at the throat; stamens included, the anthers rounded at the base. Capsule ca. 12 mm long, 3 mm wide, apically pointed and basally narrowed, the surface with glandular hairs; seeds 4-5, flat, ca. 1.8 mm in diameter.
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