10 (15)cm, rarely seen subspecies native of vertical cliffs at lower altitudes. Makes cushions of short-stemmed rosettes of glossy, fresh green to dark green, transverse elliptical, dissected leaves and lax inflorescences of pure white flowers. For any rocky soil in a partially shaded spot. Keep sunnier and drier in winter at a minimum of some 5°C. For the cold alpine house or unheated wintergarden. USDA climate Zone 10. XI-II.
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