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A herb. It has a woody rootstock. It produces new shoots from this each year. The leaves are 10 cm long by 6 cm wide. The leaves are oval. The flowers are white or pale yellow. They are 5-10 cm across. The flowers occur singly in the axils of leaves. The fruit is a capsule 18 mm long by 12 mm wide. The seeds are 2.5 mm long by 2 mm wide.
Calyx up to c. 18 mm. long, minutely pubescent and sparsely pilose; lobes up to 15 × 3·5 mm., narrowly lanceolate to elliptic, acute, often somewhat acuminate, joined for 3–4 mm. at the base.
Epicalyx of 7–9 bracts; bracts 3·5–6 mm. long, linear, usually free almost to the base but occasionally some of them united in an irregular fashion sometimes almost to the apex.
Flowers up to 5 cm. in diam., white or pale yellow, solitary, axillary; peduncle up to 6 cm. long, densely minutely pubescent, articulated near the apex.
Shrublet or perennial herb, often prostrate, producing annual shoots from a woody rootstock; stems sparsely pilose, pilose or hirsute.
Style sometimes projecting 2–3 mm. beyond the staminal tube before branching; branches 2–2·5 mm. long, pubescent.
Capsule 18 × 12 mm., ellipsoid, minutely pubescent; margins of valves pubescent.
Petals up to 3 × 2 cm., obovate to narrowly obovate, glabrous or nearly so.
Seeds 2·5 × 2 mm., angular-subreniform, glabrous or minutely pubescent.
Staminal tube 10–12 mm. long; free parts of filaments 2–3 mm. long.
