Quick Quiz: Nouns Score: Change category, Flip order Reset Incorrect! Try again. Noun: epacris purpurascens Your choice? outermost layer of the pericarp of fruits as the skin of a peach or grape a geological change in the mineral content of rock after the rock has formed a hormone secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action   (Noun: epinephrine) small shrub of southern and western Australia having pinkish to rosy purple tubular flowers