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A member of the succulent plant family, particularly adapted to arid and extremely hot environments, and characterised by spines. Often flowers at night.
Plants that have thick, fleshy leaves, which enable them to store water and so survive very dry conditions. Almost all cacti are succulents.
A branch having the form and functions of a leaf. Often the branch or stem will be flattened, resembling a leaf. Plants that have adapted to very dry conditions are usually phylloclads, eg, members of the cactus family.