Erect herbs to 35 cm high; stem quadrangular above, the younger portion pilose, glabrous below, the cystoliths prevalent in quadrangular portion. Leaves elliptic, 8-12 cm long and 3.0-5.5 cm wide, apically acuminate, basally acute, glabrous except for strigose puberulence along the costa and the veins beneath, the cystoliths numerous but narrow, visible on both the surfaces, margins entire to shallowly crenate; petiole 1-2 cm long. Inflorescences a dichasium on a peduncle to 11 cm long, the peduncle quadrangular, slightly winged, puberulous; pedicels to ca. 5 mm long; bracts oblong linear to ca. 10 mm long and 2 mm wide; bractlets linear subulate, ca. 2 mm long. Flowers with the calyx and pedicel glabrous to sparingly puberulent, the lobes ca. 3 mm long; corolla mauve, funnel-form, to 2.5 cm long, puberulent, the lower half of the tube narrow, 1.5 mm wide, the upper half narrowly campanulate, 7 mm wide at the throat, the lobes sub-orbiculate, ca. 4 mm wide; stamens included; style 12 mm long, sparingly puberulent. Capsule clavate, ca. 15 mm long, 3 mm wide, pointed at the apex and narrowed at the base, glabrous; seeds 8, flat, orbiculate, glabrous, 1.5 mm in diameter.
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