For many decades now, the preferred citrus fruit for marmalade production in Britain has been the Spanish Seville orange, " Citrus aurantium " var . " aurantium ", prized for its high pectin content, which gives a good set.
12.
Common active ingredients ( among many others ) include caffeine, theobromine, other stimulant alkaloids, psychedelic agent lysergic acid amide ( illegal in many countries ), passionflower ( sedative which contains monoamine oxidase inhibitors ), Citrus aurantium ( contains small amounts of the stimulant synephrine ), glaucine ( plant derived compound usually used as cough medicine ), and geranamine ( alkylamine compound found in geranium oil ).
