 Most cultivated "Vitis vinifera" grape vines are hermaphroditic, with both male stamens and female ovaries, while many wild grapes are either male, producing pollen but no fruit, or female, producing fruit only if a pollinator is nearby.Hermaphroditic vines are preferred for cultivation because each vine is more likely to self-pollinate and produce fruit.At the beginning of the flowering process the only part that is visible is the fused cap of petals known as the calyptra.