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Corymbia citriodora (Hook.) K.D. Hill & L.A.S. Johnson - syn. Eucalyptus citriodora Hook. - Myrtaceae
spotted gum, lemon-scented gum, Zitroneneucalyptus
„On favourable sites, these species grow to 45 m in height and 1.3 m in stem diameter, but attain only half these dimensions on poorer sites. They have straight, slender trunks with smooth bark. The bark is shed in patches, giving the species its characteristic spotted appearance. Colour tones range from pink to grey-blue.“ http://www.daff.qld.gov.au/forestry/using-wood-and-its-benefits/wood-properties-of-timber-trees/spotted-gum
„…tall tree, growing to 35 metres in height (but sometimes taller), from temperate and tropical north eastern Australia…The essential oil of the lemon-scented gum mainly consists of citronellal (80%), produced largely in Brazil and China. While unrefined oil from the lemon eucalyptus tree is used in perfumery, a refined form of this oil is used in insect repellents. The refined oil's citronellal content is turned into cis- and trans- isomers of p-menthane-3,8-diols (PMD), a process which occurs naturally as the eucalyptus leaves age. This refined oil, which includes related compounds from the essential corymbia citriodora, is known widely by its registered tradename, „Citriodiol“, but also by generic names which vary by country or continent: „oil of lemon eucalyptus“ or „OLE“(USA); „PMD rich botanic oil“ or „PMDRBO“(Europe); „PMD and related oil of lemon eucalyptus compounds“ (Canada); Extract of Lemon Eucalyptus (Australia). Pure PMD is synthesized for commercial production from synthetic citronellal.“ http://en.wikipedia.org/wiki/Corymbia_citriodora
 citronellal |  p-menthane-3,8-diols |
„In all, 19 constituents were identified in oil from juvenile and senescent leaves compared to 23 in adult leaves and 20 in leaf litter, respectively. Citronellal, a characteristic monoterpene of the oil reported hitherto was found to be more (77-78%) in the juvenile and senescent leaves compared to 48 and 54%, respectively, in the adult leaves and leaf litter. In the adult leaves, however, the content of citronellol - another important monoterpene - was very high (21.9%) compared to other leaf types (7.8-12.2%).“
[Chemical composition and phytotoxicity of volatile essential oil from intact and fallen leaves of Eucalyptus citriodora., Batish DR, Singh HP, Setia N, Kaur S, Kohli RK., Z Naturforsch C. 2006 Vol.61(7-8), 465-71] http://znaturforsch.com/ac/v61c/s61c0465.pdf
Corymbia citriodora, Kalaupapa HNP herbarium, www.hear.org