XVI International Botanical Congess

Leaf extracts of Erythroxylum ulei O. E. Schulz, produced six O-conjugated flavonoids. Three of the flavonoid aglycones were isoflavones, two were isoflavanones and the remainder a flavonol (quercetin). The major glycosides of these flavonols included mono- and dirhamnosides, mono- glucosides and galactosides with either 3', 4', or 7 linkage or a combination thereof. The two isoflavanones, in addition to being glycosylated, possessed a methyl group at position 2 of the C- ring. These flavonoids may be used as chemotaxonomic markers for the taxon.