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IN HERKOGAMY, IS ALLOGAMY ENSURED IN ALL CASES?
Transfer of pollen grains from the anther of one plant to the stigma of another plant is called allogamy or cross pollination.  This is the common form of out-breeding.  Allogamy leads to heterozygosity.  Such species develop heterozygous balance and exhibit significant inbreeding depression on selfing. Hinderance to self-pollination due to some physical barriers such as presence of hyline membrane around the anther is known as herkogamy.  Such membrane does not allow the dehiscence of pollen and prevents self-pollination such as in alfalfa.


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