Herbs, apparently ascending; stems stout, subglabrous. Leaves in subequal pairs; petiole 1.5-7 cm, subglabrous; blade drying thickly papery, brownish yellow with veins dark brown abaxially, broadly ovate or broadly elliptic, 11-16 × 5.5-10 cm, glabrous on both surfaces, base subrounded, decurrent, ± inequilateral, margins entire, apex cuspidate; secondary veins 7 or 8 pairs; stipules caducous, not seen. Inflorescence slightly sparse, many flowered, pubescent; peduncle ca. 3 cm; axes helicoid, 2-3 cm; bracteoles subulate-ensiform, 2-3 mm, costate, obtuse. Flowers distylous, subsessile. Calyx pilosulous; hypanthium turbinate, 1.5-2 mm, 10-ribbed; lobes triangular, 0.6-0.7 mm, usually with 1 gland in each sinus. Corolla pale purple, subtubular, glabrous outside; tube ca. 14 mm, pilose in basal portion inside; lobes ovate-triangular, ca. 2 mm, dorsally with very short horn, apex rostrate. Capsules dark purple, mitriform, ca. 5 × 12 mm, pilosulous. Fl. Jun-Jul.
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