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In page Eucalyptus:

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The species E. camaldulensis, E. tereticornis, and E. cladocalyx are all present in California, but the blue gum E. globulus makes up by far the largest population in the state.[2] One way in which the Eucalyptus, mainly the blue gum E. globulus, proved valuable in California was in providing windbreaks for highways, orange groves, and farms in the mostly treeless central part of the state. They are also admired as shade and ornamental trees in many cities and gardens.[citation needed]