Angiospermy
Angiospermy involves enclosing the seed or seeds in a vessel, doubling
of fertilisation that results in extra food, the endosperm, being
available for the growth of the embryo in the ovule, and the evolution
of flowers.
Sources & Further reading
Mary E. White, The Greening of Gondwana, the 400
Million Year story of Australian Plants, Reed, 1994
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