@book{193222,
	author = {Goldberg, Aaron. and National Museum of Natural History U.S.},
	title = {Character variation in angiosperm families},
	publisher = {Dept. of Systematic Biology--Botany, National Museum of Natural History},
	year = {2003.},
	series = {Contributions from the United States National Herbarium},
	address = {Washington, DC}
}