Eucalyptus camaldulensis Dehnh. - syn. Eucalyptus rostrata Schlecht. - Myrtaceae - red gum, **Roter Eukalyptus**

Evergreen tree, native to Australia. "It is a familiar and iconic tree seen along many watercourses right across inland Australia. The tree produces welcome shade in the extreme temperatures of central Australia, and plays an important role in stabilising river banks... Red gum is so named for its brilliant red wood, which can range from a light pink through to almost black, depending on the age and weathering."\\
[[http://en.wikipedia.org/wiki/Eucalyptus_camaldulensis]]

"A new compound named eucamalol and 4-isopropylbenzyl alcohol were isolated as mosquito repellents from the essential oil of Eucalyptus camaldulensis. The structure of eucamalol was elucidated to be 3-formyl-6 alpha-isopropyl-2-cyclohexen-1 beta-ol by 1H NMR analysis and confirmed by synthesis. Both compounds exhibited potent repellent activities against Aedes aegypti."  \\
[New mosquito repellent from Eucalyptus camaldulensis., Watanabe, K., Shono, Y., Kakimizu, A., Okada, A., Matsuo, N., Satoh, A., Nishimura, H., Journal of Agricultural and Food Chemistry, Vol.41(11), 1993, 2164-2166]

{{eucamalol.jpg}} (+)-eucamalol

"The mosquito-repelling activity of 4-isopropylbenzyl alcohol and eucamalol were examined against A. aegypti (Table 11.3) in comparison with that of DEET. All tested compounds exhibited potent mosquito repelling activities against A. aegypti immediately after the application. In 1 h after treatment, the effectiveness of 3 was lost. Although the duration of the effectiveness for DEET was within 2 h after the treatment by our test method, eucamalol showed 75% repellency even 3 h after the treatment. This result indicates that the
repellency of eucamalol against A. aegypti is superior to that of DEET." \\
[Potent mosquito repellents from the leaves of Eucalyptus and Vitex plants., Nishimura, H., Satoh, A., In: Biologically active natural products: Agrochemicals, CRC Press, Boca Raton, 1999, 137-146]

"The yields of leaf essential oils from the hydrodistillation of E.camaldulensis... were 0.57%... The major constituents in the E. camaldulensis leaf essential oil were α-pinene (22.52%), p-cymene (21.69%), α-phellandrene (20.08%), 1,8-cineole (9.48%), γ-terpinene (9.36%), and limonene (4.56%). The results differ from Shieh (1996), Tsiriet al. (2003), and Su et al. (2006) who reported that the main constituent of E.camaldulesis was 1,8-cineole. We assume that the discrepancy might have been caused by the differences in the
chemotype of the species." \\
[Chemical compositions and larvicidal activities of leaf essential oils from two eucalyptus species., Cheng, S.S., Huang, C.G., Chen, Y.J., Yu, J.J., Chen, W.J., Chang, S.T., Bioresource technology, Vol.100(1), 2009, 452-456] \\
[[http://esa.ipb.pt/pdf/saps9.pdf]]

{{:eucalyptus_calmodulensis.jpg}} \\
Maiden, J.H., Forest Flora of New South Wales, vol.7 t.233 (1917-1921) [M. Flockton] \\
[[http://www.plantillustrations.org/species.php?id_species=410197]]