Flavonoids as chemotaxonomic markers for Erythroxylum ulei

Leaf extracts of Erythroxylum ulei O. E. Schulz, produced six O-conjugated flavonoids. Three of the flavonoid aglycones were isoflavones, two were iso flavanones and the remainder a flavonol (quercetin). The major glycosides o f these flavonols included mono- and dirhamnosides, mono-glucosides and gal actosides with either 3', 3', or 7 linkage or a combination thereof. The tw o isoflavanones, in addition to being glycosylated, possessed a methyl grou p at position 2 of the C-ring. These flavonoids may be used as chemotaxonom ic markers for the taxon.