Glabrous perennial with obovoid to fusiform tuberous rootstock, 40-100 mm long. Stems erect, woody, gnarled and rough, usually partly underground (up to 90 mm), above ground up to ± 100 mm long, angular and furrowed. Leaves usually close together, linear to lanceolate, 30-100 mm long, apex acute or acuminate, base long-tapering or rounded, mostly subsessile, entire or with a few pinnate lobes up to 15 mm long. Flowers solitary, axillary; peduncles and pedicels short; bracteoles almost linear. Sepals subequal, oblong-lanceolate to ovate-lanceolate, 9-15 mm long. Corolla funnel-shaped, white, 20-35 mm long, 20-25 mm wide, shallowly lobed. Capsule subglobose, glabrous, 7-9 mm in diameter. Seeds 4—5 mm long, dark brown, tomentose. Flowering time September to April.
