A shrub. It grows 1.5-1.8 m high and spreads 1.2-1.5 m wide. The leaves are narrow and green. They are slightly sticky and have a smell. The leaves are narrow and sword shaped and 40-80 mm long. They are deep green above and have 3 veins in the lower half. They are paler and have white hairs underneath. The flowers are large and white. They are 70-100 mm across. They often have chocolate coloured blotches around a yellow centre. It has been used to breed other varieties. The fruit has 10 valves.
Shrubs to 25 dm, <stems usually viscid>. Leaves sessile; blade 3-veined from base, elliptic, lanceolate-elliptic, lanceolate-linear, or oblong, 40–80(–120) × 6–25 mm. Inflorescences solitary flowers. Flowers: sepals 3, <orbiculate>; petals white, sometimes with red or yellow spot near bases, 30–50 mm; styles 0–0.5 mm. Capsules 6–12-locular. 2n = 18 (Europe).