Known from only a few isolated leaf fossils, Rogersia is the one flowering plant (angiosperm; AN-gee-oh-SPERM) shown in this image. The oldest angiosperm fossils discovered date from the Early Cretaceous, and the few shrubby species found in the Washington, DC area are among the oldest discovered anywhere. Angiosperms evolved and diversified over the next 50 million years, coming to dominate many of the Earth's ecosystems. Today, more than 2,700 species live in the Washington DC area alone, and nearby wetland ecosystems host hundreds more. They all descend from a few types, like Rogersia, that lived more than 110 million years ago.
Would you like to know more about:
See flower photos for many angiosperms native to the DC area on the National Museum of Natural History Department of Botany's DC Flora web site.