Evaluation of flavonoid contents from three selected medicinal plant species of capparidaceae familygrowing in North–Western Rajasthan was carried out. The leaves of Capparis decidua, Cleome gynandraand Cleome viscosa were analysed for flavonoid contents i.e. Quercetin and Kaempferol. Flavonoidcontents like Quercetin and Kaempferol were isolated and identified. The maximum total flavonoidcontents (1.16mg./gdw) was found in leaves of Capparis decidua while minimum (0.71mg./gdw) in leavesof Cleome viscosa.