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SUBCLASS HAMAMELIDAE

Definition:

[noun] a group of chiefly woody plants considered among the most primitive of angiosperms; perianth poorly developed or lacking; flowers often unisexual and often in catkins and often wind pollinated; contains 23 families including the Betulaceae and Fagaceae (includes the Amentiferae); sometimes classified as a superorder
Synonyms: Hamamelidae, subclass Hamamelidae