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Description
Large genus with a great variety of species distributed throughout
the world. There are some 2000 species of annuals, perennials,
shrubs and trees. They come evergreen and deciduous and cover
a diverse range of form and natural habitats, from spiny and
succulent cactus-like species of hot dry areas to leafy perennials
from cool-temperate climates.
They all contain a poisonous milky sap that can cause severe
skin irritation and, sometimes even temporary blindness on contact
with the eyes!
The flowers are borne singly or in clusters, are very small
and insignificant, but are often accompanied by colourful petal-like
bracts.
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