Rounded, often divaricate shrub to c. 2.5 m high; branches usually non-tuberculate, pubescent. Leaves alternate, linear to oblanceolate, mostly 1–4 cm long and 2–14 mm wide, glabrous or sparsely hairy, acute or obtuse, margins entire. Inflorescences 1-flowered; pedicels 10–25 mm long, sigmoidal. Flowers zygomorphic; sepals ovate, 4–9.5 mm long, acuminate, imbricate, green; corolla 25–35 mm long, glabrous outside, pubescent with glandular and eglandular hairs inside, yellow to pink or carmine, usually spotted, upper lip 4-lobed; stamens 4, exserted, anthers reniform; ovary glabrous, style usually glabrous. Fruit ovoid to subglobose, 11–18 mm long, 10–17 mm diam., dry, woody, glabrous, shiny-brown. Flowers mostly May–Dec.