By extraction of freshly picked flowers of the bitter orange tree, Citrus Aurantium, subspecies amara with a hydrocarbon solvent, a concrete is produced after evaporation of the solvent. Petroleum ether is most frequently used since its low boiling point facilitates removal of this solvent without serious loss of odorous components from the flower extract. The concrete is produced in France, Italy, Morocco, occasionally in Cyprus and, on a small scale in Haiti, Formosa, the Comores, etc. The main producers are France and Italy. tsca definition 2008: extractives and their physically modified derivatives. citrus aurantium, rutaceae.