2. Aeonium haworthii Salm-Dyck ex Webb & Berthelot, Hist. Nat. Îles Canaries. 3(2,1): 193. 1841.
Shrubs closely dome-shaped, 7 dm, with many adventitious woody prop roots. Stems branched, 3-10 mm thick, woody; bark rough-reticulate and fissured. Leaves: rosettes lax, concave, 15-25-leaved, to 1 dm diam.; blade gray-green, often red-edged, obovate, 3-6 cm, 2-5 mm thick, firm, marginal cilia curved forward, broad-based, surfaces glabrous. Cymes lax, flat-topped, 0.5-1.5 dm, glabrous. Flowers bell-shaped, 1 cm diam.; calyx glabrous; petals 7-9, erect, cream. 2n = 72.
Flowering late spring. North-facing cliffs in canyons and above sea; 0-300 m; introduced; Calif.; Atlantic Islands (Canary Islands, Tenerife).
Aeonium haworthii, grown in Californian gardens, is well established locally on north-facing cliffs, both in Aliso Canyon, Orange County, and above the sea at La Jolla, San Diego County.
SELECTED REFERENCE Moran, R. V. 1991. Aeonium haworthii, a new Californian. Cact. Succ. J. (Los Angeles) 63: 203.