A very rare plant in cultivation, native to Kashmir, Burma and south-western China, that grows on open slopes, screes and rock ledges. Produces rosettes of narrow, lanceolate foliage and stems that carry unusual, large, white, spherical calyces with prominent ribs strikingly picked out in deep brown-purple. Plants are short lived but will produce plenty of seeds and will self-seed when happy. Flowering May. Height 25 cm. Sun to part shade in moisture retentive but well-drained soil.