J.C. REVY, ISM / SCIENCE PHOTO LIBRARY J.C. REVY, ISM / SCIENCE PHOTO LIBRARY
Cacti. An exotic garden display of several different cactus species. Cacti (family name: Cactaceae) are a large family of flowering plants (angiosperms) made up of over 2000 species. The spines of these plants are modified leaves forming a sharp-pointed structure. These perform the dual function of protecting the cactus from herbivores and also reducing the moisture loss associated with normal plant leaves. The flowers of a cactus are comparatively primitive, having large numbers of stamens, petals, sepals and bracts arranged spirally. Cacti are an example of succulent plants; those that can store water in swollen tissue and survive in desert regions.
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