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ABSTRACT
Two C-glycosylflavones were isolated from the root extracts of fresh material of Azolla filiculoides Lam. and A. pinnata subsp. africana (Desv.) R. M. K. Saunders & K. Fowler. They were also detected in herbarium material of A. caroliniana Willd. and A. nilotica Decne. ex Mett. Their structures were assigned to homoorientin (luteolin 6-C-glucosside) and saponarin (isovitexin 7-O-glucoside). Homoorientin and saponarin have not been previously reported in the genus Azolla. Our results indicate that roots and fronds present a different polyphenolic composition. Previous studies and our own results point to a certain chemical homogeneity in the genus Azolla, with regard to polyphenols.