LIPOPHILIC EXUDATE CONSTITUENTS OF SOME ROSACEAE FROM THE SOUTHWESTERN USA

The lipophilic epicuticular material of four shrubby Rosaceae from the Southwestern USA has been studied. They all exhibit triterpene acids as major products. Adenostoma sparsifolium and Cowania mexicana var. g laber, the two species in which glandular structures and a lipophilic excretion are obvious, produce free flavonoid aglycones as well. In Ad enostoma, most of these are very rare compounds. Cowania exhibits some trivial and one rare flavone. In Cercocarpus montanus var. glaber and in Fallugia paradoxa the epicuticular material is devoid of flavonoid s.