In stitu t für B otanik der T echnischen H ochschule, S ch n ittsp ah n straß e 3, D-W -6100 D arm sta d t, B undesrepublik D eutschland J. Jakupovic Institut für O rganische Chem ie, FB-5, T echnische U n iv ersität Berlin, Straße des 17. Juni 135,

R osaceae, E p icuticular M aterial, Flavonoid A glycones, T riterpene AcidsThe lipophilic epicuticular m aterial of four shrubby R osaceae from the Southw estern U S A has been studied. They all exhibit trite rp e n e acids as m ajor products. Adenostomci sparsifol ium and Cowania mexicana var. glaber, the two species in which glandular structures and a lipophilic excretion are obvious, p roduce free flavonoid aglycones as well. In A den ostom a, m ost of these are very rare com pounds. Cowania exhibits some trivial and one rare flavone. In Cercocarpus montanus var. glaber and in Fallugia paradoxa the epicuticular m aterial is devoid of flavonoids.