What's the difference between polygamia and polygamian?

Polygamia

Definition:

• (n. pl.) A Linnaean class of plants, characterized by having both hermaphrodite and unisexual flowers on the same plant.
• (n. pl.) A name given by Linnaeus to file orders of plants having syngenesious flowers.

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Polygamian

Definition:

• (a.) Polygamous.

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