A NEW GENUS OF PLATANACEAE FROM THE PALEOCENE OF THE AMUR REGION

Abstract

Pistillate heads with a single ripening fruit and peltate carpellodia from the Tsagayan deposits of the Amur Region are assigned to a new genus of the Platanaceae, Oreocarpa N. Maslova et Krassilov gen. nov. The heads associate with the seeds of Carinalaspermum bureicum Krassilov, staminate heads of Tricolpopollianthus burejensis Krassilov, and polymorphous leaves of "Platanus" raynoldsii Newberry emend. Brown., which apparently belong to the same plant. The significance of this find for the evolutionary morphology of the family is shown.