Herbs 30-60 cm tall, perennial, anisophyllous. Stems slightly 4-angled, sulcate, glabrous. Petiole 0.5-2.5 cm, glabrous; leaf blade elliptic, 3-9 × 1.7-4 cm, smaller of pair ca. 2/3 size of larger one but similar in shape, both surfaces glabrous, abaxially with prominent cystoliths, adaxially much paler, secondary veins 4 on each side of midvein, base attenuate and slightly decurrent onto petiole, margin slightly serrate, apex acute. Inflorescences terminal, spikes, 2-10 cm, 2-10-flowered; rachis gland-tipped pilose; basal sterile bracts leaflike but sessile or almost so, ovate, base rounded; apical floral bracts ovate-elliptic, 5-6.5 × ca. 2 mm, persistent, gland-tipped pilose, apex obtuse; bracteoles oblong-oblanceolate, ca. 8 × 1 mm, persistent until after anthesis, gland-tipped pilose, apex obtuse. Flowers opposite pairs, 1-2 cm apart on rachis. Calyx 1-1.1 cm, accrescent to ca. 1.5 cm in fruits; lobes linear, gland-tipped pilose, apex obtuse; lower 2 lobes distinct to base; upper 3 lobes connate for ca. 3 mm from base but becoming distinct in fruit, central lobe slightly longer than others and becoming subspatulate. Corolla pale violet with a white tube, 3.7-4 cm, straight, outside glabrous; tube basally cylindric and ca. 2.5 mm wide for ca. 1.1 cm then gradually widened to ca. 1.2 cm at mouth; lobes ovate, 9-10 × ca. 7 mm, apex rounded. Stamens 4, all fertile, included; filaments erect, very sparsely pilose, shorter pair ca. 2 mm, longer pair ca. 4 mm; anther thecae oblong, ca. 2 × 0.5 mm, erect, muticous. Ovary comose; style pilose. Capsule ca. 1.5 cm, glabrous except for a few gland-tipped trichomes at apex, 4-seeded. Seeds ca. 3 × 2.5 mm, lenticular, pilose; areola almost lacking. Fl. and fr. Apr.
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