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free central placentation

Bot. a type of placenta structure in an ovary, in which the ovules cluster freely around a columnlike central placenta which is attached at the base of the ovary

See free central placentation in American Heritage Dictionary 4

noun
Botany
The arrangement of ovules on a central column that is not connected to the ovary wall by partitions, as in the ovaries of the carnation and primrose.
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