Neubig, Kurt , Herrera, Fabiany , Manchester, Steven , Abbott, J. Richard .
Fossils, biogeography and dates in an expanded phylogeny of Ulmaceae.
Ulmaceae are a group of tropical and temperate trees. Historically, the family was commonly circumscribed more broadly to include what is now Cannabaceae s.l. Although Ulmaceae have only a very small number of species, little is known of generic relationships; genera such as Planera (endemic to North America) and Phyllostylon (endemic throughout the Neotropics) have remained of uncertain position within the current phylogenetic knowledge of the group. We sequenced a suite of nuclear (18S, ITS, and Xdh) and plastid (matK, ndhF, rbcL, and trnL-F) DNA regions to elucidate the phylogeny of Ulmaceae, with an emphasis on generic relationships. The results confirm two main clades: one with the mainly tropically distributed genera (Ampelocera, Holoptelea, Phyllostylon), and the other including the North Temperate genera (Hemiptelea, Planera, Ulmus, and Zelkova). Although we lack clear fossil evidence for extant genera of the tropical clade, the north temperate clade has confirmed fossil occurrences for all extant genera except Planera, plus at least one extinct genus. Finally, we used the rich fossil record of the family, based on well-preserved samaras, leaves, and wood, in combination with an ultrametric analysis, to estimate dates within the family.
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1 - University of Florida, Florida Museum of Natural History, 385 Dickinson Hall, Gainesville, FL, 32611-7800
2 - Florida Museum Of Natural History-University Of Florida, Biology-Paleobotany, Dickinson Hall, Museum Rd & Newell Dr, Uiversity Of Florida Campus, Gainesville, FL, 32611, USA
3 - University Of Florida, Florida Museum Of Natural History, PO BOX 117800, Gainesville, FL, 32611, USA
4 - Missouri Botanical Garden, P.O. Box 299, St. Louis, MO, 63166-0299
Presentation Type: Oral Paper:Papers for Sections
Location: Union A/Hyatt
Date: Tuesday, July 10th, 2012
Time: 8:30 AM