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The study of interactions between plants and animals is important for detecting the degree of vulnerability of species under the current scenario of forest fragmentation. The genus Passiflora (Passifloraceae) is widely distributed in forest formations in Brazil with about 157 species. Here we studied the pollination biology of Passiflora morifolia, a native species of Brazil that is widely distributed in the American continent. Floral biology observations, controlled pollination tests and the recording of floral visitors were carried out in an area of natural occurrence, a fragment of Araucaria Moist Forest, located in the state of Paraná, Brazil. The results showed that the species is self-compatible, with flowers that open at night and remain open and receptive in the morning. The greatest volume of secreted nectar was observed at the beginning of anthesis, when the flower released an intense sweet odor and received visits from nocturnal and crepuscular bees. The bees Megommation insigne and Ptiloglossa willinki were the first visitors to the opened flowers and also the main pollinators. [ABSTRACT FROM AUTHOR]

The breeding system, fruit set, seed set, floral visitors and pollination of Cologania broussonetii were studied. Four pollination treatments were applied: autogamy, geitonogamy, xenogamy, and natural pollination (flowers exposed to pollinators). The frequency of visits was recorded, and pollen grains deposited per stigma on bagged (self pollen deposition) and exposed flowers were counted. The results indicate that this species is self-compatible and autogamus. A small number of low quality fruits and seeds (lowest mass and germination capability) were obtained by spontaneous self-pollination. When fruits obtained by natural pollination were analyzed, a specific pattern of seed formation was detected: ovules were successively fertilized from the apical to the basal portion of the ovary. However, no pattern was observed for seed abortion. The frequency of visits of possible pollinators (species of Bombus) was very low. The number of pollen grains per stigma was similar on bagged and exposed flowers. Nevertheless, the comparison of quantity and quality of fruits and seeds obtained by natural and autonomous self-pollination suggests that the visits of pollinators contribute to increase the quality of seeds (higher mass and germination capability). [ABSTRACT FROM AUTHOR]