Aeonium arboreum (L.) Webb & Berthel.
Diagnostic description:
A branching, woody perennial 40 to 80 cm tall. Stems bear many scars of leaves which have fallen off. Leaves fleshy, oblanceolate, cuneate, 3 to 6 cm long, shiny; the upper ones forming a terminal rosette. Flowers yellow, from 1 to 2 cm across, in dense, rounded, many-flowered panicles.
Distribution:
Local: Very common in Gibraltar. Found along the south-eastern cliffs, the East Side sand slopes, above Camp Bay and around Europa Pass.
Global: Believed to be native to North Africa. Also found along the coasts of Portugal and north-west Spain.
Ecology:
Flowers between (December) January and February (April).
Habitat:
Grows on limestone cliffs. An introduced species which has become naturalised.