Flavonoid frond exudates from two Jamaican ferns, Pityrogramma tartarea and P. calomelanos

Abstract

Three flavonoids have been identified from the frond exudate of P. tartarea: 2′,6′-dihydroxy-4, 4′-dimethoxydihydrochalcone, kaempferol 7-methyl ether (rhamnocitrin), and apigenin 7-methyl ether (genkwanin). White-backed fronds of P. calomelanos contained 2′,6′-dihydroxy-4′-methoxydihydrochalcone. © 1971.