most frequently occurring in nature are the glycosides of cyanidin, delphinidin, malvidin, pelargonidin, peonidin, and petunidin. roughly 2% of all hydrocarbons fixed in photosynthesis are converted into flavonoids and their derivatives, such as the anthocyanins. not all land plants contain anthocyanin; in the caryophyllales (including cactus, beets, and amaranth), they are replaced by betalains. anthocyanins and betalains have never been found in the same plant.