Eucalyptus smithii

Tea tree oil Melaleuca alternifolia Cheel, Melaleuca linariifolia Sm., Melaleuca dissitiflora Mueller Eucalyptus oil Eucalyptus globulus Lab ill., Eucalyptus fructicetorum R v. Mueller ex Miquel, Eucalyptus smithii R. T. Baker... 

The main essential oil-producing species of Eucalyptus include Eucalyptus globulus, also called blue gum eucalyptus Eucalyptus dives, known as broadleaved peppermint eucalyptus Eucalyptus citriodora, known as lemon-scented eucalyptus Eucalyptus radiata, known as narrow-leaved peppermint gum Eucalyptus smithii, known as gully gum and Eucalyptus polybractea, known as blue mallee. Within each species there are many subspecies and chemo-types. This illustrates a very complex situation, producing essential oils with varying compositions and properties. 

The oil is produced from the leaves and twigs of Eucalyptus globulus Labillardiere [283-406-2 84625-32-1], Eucalyptus polybractea R. T. Baker [294-961-5 91771-67-4], Eucalyptus smithii R. T. Baker [294-962-0 91771-68-5] (Myrtaceae) by steam distillation. 

Definition Eucalyptus oil is obtained by steam distillation and recti cation of the fresh leaves or the fresh terminal branchlets of various species of Eucalyptus rich in 1,8 cineole. The spe cies mainly used are Eucalyptus globulus LabilL, Eucalyptus polybractea R.T. Baker, and Eucalyptus smithii R.T. Baker. 

Eucalyptus Eucalyptus globulus E. smithii E. polybractea (Myrtaceae) fresh leaves... 

Eucalyptus citriodora Hook f (Lemon gum) The oil of the fresh leaves of E. citriodora (2.2-8.3%), a tree introduced into Kenya from Australia (68), has been well researched in Kenya. Results indicate that there are two chemical varieties that were introduced. The chief essential oil constituents of one variety are citronellal (65-88%), citronellol (2-25%) and isopulegol (2-19%). In constrast, the second variety has as its major essential oil consitutents citronellol (32-52%), citronellal (38-59%) and 1,8-cineole (2-19%) (68,69). The essential oil is regarded as a perfumery oil. This plant is the second most commercially important Eucalyptus species in the essential oil trade and is only second to E. smithii Baker (69). The aromatic oil is used in soaps, creams and lotions due to its desirable odor properties, and as with many other essential oils is also used extensively in many technical preparations to mask other industrial malodors. A highly active mosquito repellent compound, p-menthane 3,8-diol has been isolated from the waste water of distillation of E. citriodora. There are now many commercial mosquito repellents based on this waste water (70-73). 

Production By steam distillation of leaves of Eucalyptus globulus (Spain, Portugal, China, Chile), E. smithii (South Africa), E. polybractea and E. radiata (Australia). The world-wide annual production is probably between 2000 and 30001. 

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