On shingle ridges in Britain, vegetation is similarly almost absent
from the ridges closest to the sea, especially on their seaward slopes.
Further inland, however, there are often abundant supplies of fresh
water from springs, marshes or lakes and they enable a wide range of
plants that are not halophytes to grow between the pebbles where
humus can form. Characteristic plants include the yellow horned
poppy (Glaucium flavum), sea campion and red fescue (Festuca rubra).
Chesil Beach in Dorset and Dungeness in Kent are two extensive areas
with pebble ecosystems.