Chemical examination of the leaves of Betula platyphylla var. latifolia has led to the isolation and characterization of five flavonoid glycosides including two C-glucosyl flavonoids. The structures of these compounds were elucidated as myricetin $3-O-{alpha}-_L-rhamnoside$ (myricitrin), $quercetin-3-O-{eta}-_D-glucopyranoside$ (isoquercitrin), $quercetin-3-O-{eta}-_D-glucopyranoside$ (hyperoside), $nalingenin-6-C-{eta}-_D-glucopyranoside$ (hemiphloin) and $aromadendrin-6-C-{eta}-_D-glucopyranosidre(6-C-glucosyldihydrokaempferol)$ on the basis of physico-chemical and spectroscopic evidences.