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Navelwort leaf

A single leaf of Umbilicus rupestris, photographed on Christmas Day. This is a wild member of the Crassula family of succulents, whose name derives from the Latin 'crassus' meaning thick (etymologically identical to the uncomplimentary term 'crass').
Navelwort is a common plant of Britain's southwestern seaboard but is rarely found in the east. It loves to grow among rock and stone, whether natural or human-made structures, as here on the wall-bank of a lane.
The leaf veins radiate from the central umbilicus which can often be seen to hold a droplet of water. The leaves vary greatly in size and can reach several inches across.
Herbalists refer to this plant by its earlier name, Cotyledon umbilicus. A distillation of its leaves was said to have a healing effect on chilblains, piles and other inflammations.