it is a compact or scrambling shrub, growing to 1 m in height. the leaves are crowded, in whorls of three or four, narrowly elliptic, 10–20 mm long and 1–3 mm wide, with recurved edges. the flowers are white, often with pink spots in the throat of the corolla. the seeds are 1.5–2 mm long. the flowering season is from april to december.