Two new flavonoid glycosides, takakin 8-O-beta-D-glucuronide 6''-methyl ester (2), takakin 8-O-beta-D-glucuronide 2''-sodium sulfate (3) together with a known flavonoid glycoside, takakin 8-O-beta-D-glucuronide were isolated from the root bark of Helicteres angustifolia (Sterculiaceae). The structures of these compounds were established on the basis of spectroscopic and chemical evidence.