Phytochemical reinvestigation of Tabebuia argentea leaves and Catalpa bignonioides petioles extracts (Bignoniaceae) allowed to isolate two compounds not described before: one glycosylated lignan and one phenolic glycoside characterized as 5-hydroxysesamin 5-O-b-D-glucopyranosyl-(1 ! 2)-[b-D-glucopyranosyl-(1 ! 6)]-b-D-glucopyranoside (1) and 1-benzyl-[6-p-hydroxybenzoyl]-b-D-glucopyranosyl- (1 ! 3)-b-D-glucopyranoside (2), respectively. Their structural characterization was obtained on the basis of extensive NMR spectral studies. Five known phenolic glycosides along with six flavonol glycosides were also isolated and characterized.