, Volume 25, Issue 4, pp 334–355 | Cite as

Fossil forms of Amentiferae

  • Jack A. Wolfe


Review of the procedures used in determining fossil plant organs indicates that the many Cretaceous records of extant genera of “Amentiferae” based on leaves should be rejected as theoretically unreliable. Palynological data, in combination with some valid megafossil data, indicate that most recognizable members of “Amentiferae” are no older than the later part of the Late Cretaceous. Juglandales appear to be derivatives of the ancient Normapolles complex and unrelated to other “Amentiferae.” A preliminary account of some of the comparative foliar morphology of extant “Amentiferae” indicates that some—particularly Betulaceae and Fagaceae—are closely related to Hamamelidales but that other families—notably Rhoipteleaceae, Juglandaceae, Didymelaceae, and Leitneriaceae—are unrelated to this order.


Pollen Type Secondary Vein Extant Genus Venation Pattern Atlantic Coastal Plain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© The New York Botanical Garden 1973

Authors and Affiliations

  • Jack A. Wolfe
    • 1
  1. 1.U.S. Geological SurveyMenlo Park

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