Herb, 1-2 m. Stem and branches erect and slender, obscurely angular, puberulent. Leaves more or less succulent, suborbicular or reniform, 4-7.5 by 5-6.5 cm, rounded, base truncate, entire; margin elsewhere irregularly crenate or double-dentate; petiole 1.5-3 cm, slender, hairy. Flowers 6-8 in verticillasters, forming lax spicate inflorescences disposed in a large terminal panicle 20-25 cm long, 10-12 cm wide. Pedicels divaricate, 2 mm. Calyx campanulate, 2.5 mm long, upper tooth broad and 3-veined, lower 4 teeth sharply pointed. Corolla light blue, 6-7 mm long; tube slender, constricted at about the middle, slightly gibbous near the base; limb 2-lipped, upper lip recurved, lower lip concave, notched. Stamens 4, attached on the throat of corolla, enclosed. Style shortly 2-fid.
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