(syn and genesis, "congregation"), the name of the 10th class in Linnaeus's artificial system; comprehending those plants which have the anthers united into a cylinder. The orders are fix: 1. Polygamia equialis. 2. Polygamia superflua. 3. Polygamia fruticosa. 4. Polygamia acicularis. 5. Polygamia fregereata. 6. Monogamia. The five first orders contain the compound flowers, and form a class truly natural.