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What is the difference between apogamy and partheno apogamy?
Related to reproduction in flowering plants.

Apogamy is a related term that has had various meanings over time. In plants with independent gametophytes (notably ferns), the term is still used interchangeably with "apomixis", and both refer to the formation of sporophytes by parthenogenesis of gametophyte cells.
Apogamy is a name which refers to the fact that a plant which ordinarily comes from a fertilized egg may, under certain conditions, develop in some other way. It is a general term, used to cover all cases in which the asexual plant does not come from a fertilized egg, without reference to the method of its origin.

'Parthenogenesis' is that form of Apogamy in which a plant is developed from an egg that has not been fertilized. In other eases of Apogamy the new plant is developed in a vegetative way from various other tissues. The phenomenon of Apogamy has been observed chiefly among the ferns, which seem to respond most readily to the conditions which favor it. Numerous eases have now been observed, in which the leafy plant arises in various ways directly from the prothallium, without the fertilization or even production of an egg.