Page 1 Page 2 Source: Ferwerda FP (1976) Coffees. Coffea spp. (Rubiacese) In Simmonds NW (ed.) Evolution of Crop Plants. Longman. pp. 257–260. Caffeine structurePage 3 ! Food of the Gods? Plant Biology SC/BIOL 2010!Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10