Kvacek, Zlatko , Manchester, Steven R. .
Compound leaves and inflorescences and of the extinct Platanus neptuni complex in the Oligocene of Oregon, USA—a biogeographic connection with the Tertiary of Europe.
Platanus neptuni (Ettingshausen) Bužek, Kvaček et HÃ³ly, formerly reported on the basis of infructescences and staminate inflorescences with associated foliage from the Late Eocene to Late Miocene of Europe, is now recognized also in North America, based on a population dominating the Late Oligocene Yaquina flora of coastal Oregon. Staminate and pistillate inflorescences show the same morphology as specimens from Europe: globose to ellipsoidal, each borne solitarily on a thick, elongate peduncle. A circumsissle raised scar is visible around the peduncle at the base of inflorescence heads is a feature diagnostic of the extinct Platanus subgenus Glandulosa Z. Kvacek, Manchester & Guo. Contrary to the European records, which are more variable in foliage (simple to compound tri- and pentafoliolate), leaves at the Yaquina locality are exclusively trifoliolate, with short, basally expanded petioles, as in many European populations of P. neptuni morphoforma fraxinifolia. Preservation in coarse deposits precludes anatomical investigation, but the morphology of both leaves and reproductive structures provide for confident assignment to the same species previously recognized only from Europe. This occurrence supplements our previous report of Platanus bella (Heer) Kvacek, Manchester & Guo from a single locality in the Paleocene of Wyoming indicating that Platanus subgenus Glandulosa survived in North America as late as the Oligocene.
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1 - Charles University in Prague, Institute of Geology and Palaeontology,
2 - Florida Museum of Natural History, Dickinson Hall, P.O. Box 117800, Gainesville, Florida, 32611, USA
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Superior A/Cliff Lodge - Level C
Date: Wednesday, July 29th, 2009
Time: 2:30 PM