14C02 was supplied to single leaves of the vegetative shoot part of F. imperialis plants under conditions of photosynthesis. Three days later the bulbs were harvested, cut into slices, and freeze-dried. Autoradiograms showed the l4C to be localized in a 1/5 sector of the transverse sections of the bulbs. The phyllotactic arrangement on the vegetative shoot part of the plants used was 2/5, thus 5 rows of leaves (orthostichies) could be distinguished. The bulb scales, however, are arranged in a 1/2 phyllotactic configuration. Nevertheless, each row of leaves of the vegetative shoot supplies a 1/5 sector of the bulb with photosynthates, irrespective of the arrangement of the bulb scales.