Ulmus leaves and fruits from the Early–Middle Eocene of northwestern North America: systematics and implications for character evolution within Ulmaceae

Author: Denk Thomas   Dillhoff Richard M.  

Publisher: NRC Research Press

ISSN: 1480-3305

Source: Canadian Journal of Botony, Vol.83, Iss.12, 2005-12, pp. : 1663-1681

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