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Pteronia incana (Burm.) DC - Asteraceae - blue bush
Invasive shrub of South Africa.
„Pteronia incana produces a yellowish oil with a strong fragrance. Interest in this oil has been primarily due to its unique odour properties which make it suitable for use as a fragrance… Pteronia incana oil had a higher content of p-cymene as well as limonene + 1,8 cineole, and lower content of mycerene than that reported by Bruns & Meiertoberens (1987). Moreover, the oil contained o-cymene, which had not been reported… Pteronia incana oil also displayed a fairly broad spectrum of antibacterial activity, particularly at higher concentrations. However, it was less efficient than A. afra and R. officinalis oils. Enterobacter cloacae and Staph. aureus showed the highest sensitivity to P. incana oil.“ [] http://onlinelibrary.wiley.com/doi/10.1046/j.1365-2672.1999.00525.x/ful