Erect perennial to 1 m tall, glabrous. Leaves cauline, ±clustered towards stem apices, linear to narrowly obovate, entire or dentate, thick; lamina 4-6 cm long, 2-10 mm wide. Flowers in thyrses to 20 cm long; bracts linear, c. 5 cm long; peduncle to 20 mm long; bracteoles linear, c. 2 mm long; pedicel 1-3 mm long. Sepals linear to triangular, 7-8 mm long. Corolla 8-18 mm long; lobes ±equal, c. 7-11 mm long; wings c. 1 mm wide. Ovary with septum c. 1/2 its length; ovules 30-40; style with short, simple hairs and glandular hairs. Fruit a capsule, 2-valved, ovoid to ellipsoidal, c. 5-7 mm long. Seeds elliptic, c. 1 mm long.
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