What is Dichogamy and Herkogamy ?

Hi,

Dichogamy and herkogamy are two contrivances of cross pollination. Dichogamy is the opposite of homogamy. Here stamens and carpels of bisexual flowers mature at different times. Thus, leaving no option than cross-pollination. Dichogamy is of two types,

Protogyny – When gynoecium develops earlier than anthers as in Peepal.

Protoandry – When androecium develops earlier than carpels as in pea, sunflower etc.

Herkogamy – Herkos means barrier. When some sort of barrier develops between stamens and pistil of same flowers, and prevents self pollination. e.g., in pansy, a hood, covers the stigma and acts as a barrier for self pollination.

Hope this answers your question,

Cheers!!