10 (15)cm, threatened species from the highest peaks of central Madeira. Ornamental, branching sub shrub with grayish green leaves, densely covered with white wax and quite large, white flowers. For any rocky soil in full sun. Keep drier and always sunny in winter at min. 5°C. may endure slight frost in autumn. Excellent under cold glass ort the alpine house. USDA Climate Zone 9. VI-VIII.