@book{192729,
	author = {United States National Herbarium.},
	title = {Contributions from the United States National Herbarium },
	publisher = {Smithsonian Institution Press},
	address = {Washington :},
	url = {http://www.sil.si.edu/SmithsonianContributions/USNatHerb/sc_Browse.cfm?by=Volume}
}