banana flowers are often times found on female plants that self pollinate at the very end of flowering. Many strains do this naturally as a way of ensuring survival, and sometimes will pop a few flowers when you stress them or fuck with the photoperiod. These differ slightly from straight on male pollen sacs.

The bud is the females flower, and the male pollen sacs is its own flower. They grow the same as females but instead of colas they have big collections of pollen excreting flowers.

You wont have pollen until the pollen sacs mature. Think of human reproduction, except for the the fact that marijuana plants can actually fuck themselves............