Florin, R. ( 1931) Untersuchungen zur stammesge-schichte der coniferales und cordaitales K. Svenska Vetensk. Akad. Handl. 10, 1–588.

Fontaine, W. M. ( 1889) The Potomac or younger Mesozoic flora. U.S. Geol. Survey, Monogr. 15, 1–377.

Friis, E. M., Pedersen, K. R. & Crane, P. R. ( 1999) Early angiosperm diversification: the diversity of pollen associated with angiosperm reproductive structures in Early Cretaceous floras from Portugal. Ann. Missouri Bot. Gard. 86, 259–296.

Gandolfo, M. A., Nixon, K. C. & Crepet, W. L. ( 1998a) Tylerianthus crossmanensis gen. et sp. nov. (Aff. Hydrangeaceae) from the Upper Cretaceous of New Jersey. Am. J. Bot. 85, 376–386.

Gandolfo, M. A., Nixon, K. C. & Crepet, W. L. ( 1998b) A new fossil flower from the Turonian of New Jersey: Dressiantha bicarpellata gen. et sp. nov. (Capparales). Am. J. Bot. 85, 964–974.

Gandolfo, M. A., Nixon, K. C., Crepet, W. L., Stevenson, D. W. & Friis, E. M. ( 1998c) Oldest known fossils of monocotyledons. Nature (London) 394, 532–533.

Grimaldi, D. ( 1999) The co-radiations of pollinating insects and angiosperms in the Cretaceous Ann. Missouri Bot. Gard. 86, 373–406.

Haq, B. U. & van Eysinga, F. W. B. ( 1998) Geological Time Table (Elsevier Science, Amsterdam), 5th Ed.

Herendeen, P. S. ( 1990) Fossil History of the Leguminosae from the southeastern North America Ph. D. dissertation (Indiana University, Bloomington), 282p.

Herendeen, P. S. & Dilcher, D. L. ( 1990a) Diplotropis (Leguminosae, Papilionoideae) from the Middle Eocene of southeastern North America. Syst. Bot. 15, 526–533.

Herendeen, P. S. & Dilcher, D. L. ( 1990b) Fossil mimisoid legumes from the Eocene and Oligocene of southeastern North America. Rev. Palaeobot. Palynol. 62, 339–361.

Herendeen, P. S. & Dilcher, D. L. ( 1991) Caesalpinia subgenus Mezoneuron (Leguminosae, Caesalpinioideae) from the Tertiary of North America. Am. J. Bot. 78, 1–12.

Herendeen, P. S., Crepet, W. L. & Dilcher, D. L. ( 1992) The fossil history of the Leguminosae: Phylogenetic and Biogeographic implications. In Advances in Legume Systematics: Part 4, The Fossil Record, eds. Herendeen, P. S. & Dilcher, D. L. (Royal Botanic Gardens, Kew), pp. 303–316.

Hickey, L. J. ( 1973) Classification of the architecture of dicotyledonous leaves. Am. J. Bot. 60, 17–33.

Hickey, L. J. & Wolfe, J. A. ( 1975) The bases of angiosperm morphology. Ann. Missouri Bot. Gard. 62, 538–589.

Huang, Q. C. ( 1992) The paleoecological and stratigraphic implications of dispersed cuticle from the Mid-Cretaceous Dakota Formation of Kansas and Nebraska, Ph. D. dissertation (Indiana University, Bloomington), 221p.

Jones, J. H. & Dilcher, D. L. ( 1980) Investigations of angiosperms from the Eocene of North America: Rhamnus marginatus (Rhamnaceae) reexamined. Am. J. Bot. 67, 959–967.

Jones, J. H. ( 1984) Leaf architectural and cuticular analysis of extant Fagaceae and “Fagaceous” leaves from the Paleocene of southeastern North America, Ph.D. dissertation (Indiana University, Bloomington), 328p.

Kovach, W. L. & Dilcher, D. L. ( 1988) Megaspores and other dispersed plant remains from the Dakota Formation (Cenomanian) of Kansas. Palynology 12, 89–119.

Labandeira, C. C., Dilcher, D. L., Davis, D. R. & Wagner, D. L. ( 1994) Ninety–seven million years of angiosperm-insect association: Paleobiological insights into the meaning of coevolution. Proc. Natl. Acad. Sci. USA 91, 12278–12282.

Labandeira, C. C. ( 1998) How old is the flower and the fly? Science 28: 57–59.

LAWG (Leaf Architecture Working Group). ( 1999) Manual of Leaf Architecture: Morphological Description and Categorization of Dicotyledonous and Net-Veined Monocotyledonous Angiosperms (Smithsonian, Washington, DC.), 65p.