Fig. 1.

a Longitudinal section of a P. edulis flower, showing the floral organs and the nectary. b Magnification of the area of the nectary, where the operculum (op) and the limen (li) can be visualized enclosing the nectary chamber. c A carpenter bee (Xylocopa sp.), the P. edulis pollinator, landed on the corona to collect nectar. d Inflorescence models for Passifloraceae based on Krosnick and Freudenstein [9]. The general inflorescence type in the family is a compound cyme (I). The first-order axis (1b) may terminate in a flower (I) or a tendril (II). Different degrees of reduction of the inflorescence can be observed. In the genus Passiflora, most of the species have very reduced peduncles (III and IV), which is recognized by the retention of the tendril between the two flowers (III). In the case of P. edulis, there is only one second-order axis (2), which terminates in a single flower