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In page Apomixis:

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Agamospermy, asexual reproduction through seeds, occurs in flowering plants through many different mechanisms[1] and a simple hierarchical classification of the different types is not possible. Consequently, there are almost as many different usages of terminology for apomixis in angiosperms as there are authors on the subject. For English speakers, Maheshwari 1950[2] is very influential. German speakers might prefer to consult Rutishauser 1967.[3] Some older text books[4] on the basis of misinformation (that the egg cell in a meiotically unreduced gametophyte can never be fertilized) attempted to reform the terminology to match the term parthenogenesis as it is used in zoology, and this continues to cause much confusion.[citation needed]