Perennial herb, robust, erect or ascending, c. 40–50 cm high, subglabrous or glandular-hairy; hairs a mixture of type 1 and type 3, predominantly type 3. Leaves ovate to linear-lanceolate; lamina 2–6 cm long; petiole to 1.5 cm long. Inflorescence a terminal, repeatedly branched, diffuse cyme; basic inflorescence unit a solitary flower; pedicels slender to filiform, 10–30 mm long. Perianth glabrous or sparsely glandular-hairy, the upper part trumpet-shaped, c. 2 mm long, mauve-pink. Stamens 2 or 3, sometimes 4 or 5; filaments 1–2.5 mm long. Style 1–3 mm long. Fruit broadly fusiform or clavate, 4–5 mm long, 2–2.5 mm wide, subglabrous or sparsely glandular-hairy; ribs 5, prominent, blunt, mucous; furrows narrow.
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