@inbook {619,
	title = {Compositae},
	booktitle = {Die Nat{\"u}rlichen Pflanzenfamilien},
	volume = {4(5)},
	year = {1894},
	pages = {87-387},
	publisher = {Engelmann},
	organization = {Engelmann},
	address = {Leipzig},
	author = {Hoffmann, P.},
	editor = {Engler, A and K. Prantl}
}
@book {218,
	title = {Flora of North America},
	series = {Magnoliophyta: Asteridae(in part): Asteraceae, part1},
	volume = {19},
	year = {2006},
	pages = {202-203},
	publisher = {Oxford University Press, Inc.},
	organization = {Oxford University Press, Inc.},
	address = {New York},
	url = {www.fna.org},
	author = {Strother, John L},
	editor = {Flora of north America Editorial Commitee ,}
}
@booklet {115,
	title = {The PLANTS Database},
	year = {2010},
	url = {http://plants.usda.gov},
	author = {USDA, NRCS}
}
