Eucalyptus, commonly known "Down Under" as "Gum" trees represent an enormous genus of trees and shrubs. Over 600 species have already been classified, many of these species have numerous cultivars and hybrids. At least as many more species are yet to be classified. Eucalyptus seed is unstable genetically so new species and varieties are constantly being introduced. This genetic instability is one of the reasons for the success of the eucalyptus.
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