sentence: common examples are paraffins in leaves of pea and cabbage , alkyl ester in leaves of carnauba palm and banana , the asymmetrical secondary alcohol 10-nonacosanol in most conifer such as ginkgo biloba and sitka spruce , many of the ranunculaceae , papaveraceae and rosaceae and some mosses , symmetrical secondary alcohol in brassicaceae including arabidopsis thaliana , primary alcohol ( mostly octacosan-1-ol ) in most grasses poaceae , eucalyptus and legume among many other plant groups , β - diketone in many grasses , eucalyptus , box buxus and the ericaceae , aldehyde in young beech leaves , sugarcane culms and lemon fruit and triterpene in fruit waxes of apple , plum and grape epicuticular wax crystals surrounding a stomatal aperture on the lower surface of a rose leaf .