caa a22 4500 477038565 CHVBK 20180405111311.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF00983381 doi (NATIONALLICENCE)springer-10.1007/BF00983381 Allonia decandra: Floral remains of the tribe Hamamelideae ( Hamamelidaceae ) from Campanian strata of southeastern USA [Elektronische Daten] [Susana Magallon-Puebla, Patrick Herendeen, Peter Endress] A single flower, detached anthers with in situ pollen grains, and isolated seeds from Campanian strata (Upper Cretaceous) of Georgia, southeastern USA, document the presence of plants assignable toHamamelidaceae in the Upper Cretaceous. The fossil flower is actinomorphic, pentacyclic and pentamerous. Irregular sepals are preserved as lobes of the floral cup, and petals are narrow, with parallel margins. The androecium has two whorls of functional stamens. Anthers are tetrasporangiate, dehisce through two valves, and have strongly elongate connective protrusions which converge over the center of the flower. The organizational and architectural features of the fossil document its affinity within subtribeLoropetalinae (Hamamelideae, Hamamelidoideae). Cladistic phylogenetic analyses using parsimony were conducted to explore the relationships between the fossil flower and extant genera of the tribeHamamelideae. The strict consensus of the four most parsimonious trees showsHamamelideae andLoropetalinae as well-supported monophyletic taxa. The fossil flower is clearly included within theLoropetalinae, and is placed as sister taxon to the southeastern Asian genusMaingaya. The occurrence of fossils assignable toLoropetalinae during the Campanian documents the existence ofHamamelidaceae with a level of floral organization and character evolution equivalent to that of extant genera, early in the evolutionary history of the family. Springer-Verlag, 1996 Eudicots nationallicence Hamamelidaceae nationallicence Loropetalinae nationallicence Allonia decandra nationallicence Fossil flower nationallicence Campanian nationallicence paleobotany nationallicence Magallon-Puebla Susana Department of the Geophysical Sciences, The University of Chicago, 5734 S. Ellis Avenue, 60637, Chicago, Illinois, USA aut Herendeen Patrick Department of Geology, The Field Museum, Roosevelt Road at Lake Shore Drive, 60605, Chicago, Illinois, USA aut Endress Peter Institut für Systematische Botanik der Universität, Zollikerstrasse 107, CH-8008, Zürich, Switzerland aut Plant Systematics and Evolution Springer-Verlag 202/3-4(1996-09-01), 177-198 0378-2697 202:3-4<177 1996 202 606 https://doi.org/10.1007/BF00983381 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00983381 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Magallon-Puebla Susana Department of the Geophysical Sciences, The University of Chicago, 5734 S. Ellis Avenue, 60637, Chicago, Illinois, USA aut NATIONALLICENCE 700 1- Herendeen Patrick Department of Geology, The Field Museum, Roosevelt Road at Lake Shore Drive, 60605, Chicago, Illinois, USA aut NATIONALLICENCE 700 1- Endress Peter Institut für Systematische Botanik der Universität, Zollikerstrasse 107, CH-8008, Zürich, Switzerland aut NATIONALLICENCE 773 0- Plant Systematics and Evolution Springer-Verlag 202/3-4(1996-09-01), 177-198 0378-2697 202:3-4<177 1996 202 606 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 187494541 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer