Leaf surface flavonoids of Eriodictyon trichocalyx

Extraction of the leaf resin of Eriodictyon trichocalyx var. trichocalyx ether, yielded naringenin, eriodictyol, eriodictyol 3′-methyl ether, apigenin, 6-methoxy-apigenin, luteolin, 6-methoxyluteolin, chrysoeriol, luteolin 3′,7-dimethyl ether and isorhamnetin. The flavonoid profile agrees weil in most respects with the types of compounds exhibited by other Eriodictyon species, particularly with regard to the presence of 6-substituted flavones and a moderate level of O-methylation. Flavonoid variation in E. californicum is briefly discussed.