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Leaves often erect, glabrous or asperulous; leaf lamina linear-lanceolate, ovate-lanceolate to oblong, 4–22 × 0·3–4 cm., acute at the apex, usually tapering, rounded or cuneate at the base, occasionally incised or trisected, rigid, glabrous or with short bristles on the nerves and margins, often with distinct reticulate nervation; petiole stout, 5–10 mm., long, caniculate above, glabrous or minutely puberulous.
A herb that keeps growing from year to year. It has a woody rootstock or round tuber. The stems are 50 cm long and stiff. They can be erect or lie along the ground. The leaves are narrowly sword shaped. The flowers are in groups of 1-3 in the axils of leaves. The flowers are funnel shaped and 5-9 cm long. They are pink or white with a darker centre. The fruit is a round capsule. It is leathery.
Inflorescences axillary, 1–3-flowered, sometimes profusely flowered when the plant is almost leafless; peduncle up to 1 cm. long, stout, glabrous; bracts minute, lanceolate; pedicels subclavate up to 1·2 cm. long.
Corolla funnel-shaped, rose-pink or white with pink or mauve centre 5–9·5 cm. long, with distinct midpetaline areas ending in mucronate-aristate points.
Stems several, up to 50 cm. long, suberect or prostrate, sometimes rather stout, stiff, glabrous or minutely puberulous.
Sepals subequal, lanceolate 1–1·4 cm. long, acuminate or subacute, glabrous or minutely puberulous.
Perennial herb with a woody rootstock or globose tuber as big as a cricket ball.
Seeds brown shortly puberulous with a basal tuft of hairs near the hilum.
Capsule globose, coriaceous, apiculate, glabrous.
