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In some genera of flowering plants, and notably in Bryophyllum, little plants form on various parts of the leaves.

In other cases small portions of the stem or leaves give rise to new plants by budding, as in Bryophyllum, where buds develop at the edges of the leaf and form new plants.

Placentation.—Some botanists have considered the placentas to be portions of the carpel, and have compared the production of ovules on them to the formation of buds on the leaf of Bryophyllum.

This happens in some plants more readily than in others—Bryophyllum calycinum is a well-known instance.