“…Collections of Tm from San Juan, Mendoza and Rio Negro showed dihydrotagetone as major constituent (Gil et al, 2000). Plants coming from Buenos Aires showed cis-tagetone, dihydrotagetone and cis-β-ocimene approximately 20% each; plants obtained from Jujuy showed significant amounts of cis-β-ocimene (26%), cis-tagetone (19%), cistagetenone (17%) and trans-tagetenone (12%); and a collection from Salta showed high amounts of trans-β-ocimene (34%) and α-phellandrene (29%) (Gil et al, 2000;Vázquez et al, 2011). Essential oils of Tm collected in various localities of Cordoba province were dominated by cis and trans-ocimene, cis and trans-tagetenone, and cis-and trans-tagetone (Zygadlo et al, 1990) while collections from Chaco contain mostly dihydrotagetone accompanied by β-ocimene, tagetone and tagetenone (Chamorro et al, 2008).…”