@book {156,
	title = {An Illustrated Flora of the Northern United States, Canada And The British Possessions},
	volume = {3},
	year = {1913},
	publisher = {Charles Scribner{\textquoteright}s Sons},
	organization = {Charles Scribner{\textquoteright}s Sons},
	edition = {2},
	author = {Nathaniel Lord Britton and Addison Brown}
}
@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 {152,
	title = {Flora boreali-americana :sistens caracteres plantarum quas in America septentrionali collegit et detexit Andreas Michaux.},
	volume = {2},
	year = {1803},
	pages = {89-90},
	author = {Andre Michaux}
}
@book {118,
	title = {Flora caroliniana: secunda systema vegetabilium perillustris Linnaei digesta...},
	year = {1788},
	note = {Flora caroliniana: secunda systema vegetabilium perillustris Linnaei digesta; characteres essentiales naturalesve et differentias veras exhibens; cum emendationibus numerosis: descriptionum antea evulgatarum: adumbrationes stirpium plus mille continens: necnon, generibus novis non paucis, speciebus plurimis novisq.},
	address = {London},
	author = {Walter, Thomas}
}
@article {160,
	title = {Risks of Species Introduced for Biological Control},
	journal = {Biological Conservation},
	volume = {78},
	year = {1996},
	pages = {185-192},
	chapter = {185},
	author = {Daniel Simberloff and Peter Stiling}
}
@article {159,
	title = {The Internal Cuticle of Cirsium horridulum (Asteraceae) Leaves},
	journal = {American Journal of Botany},
	volume = {86},
	year = {1999},
	month = {01/1999},
	pages = {928},
	chapter = {923},
	author = {Thomas C. Pesacreta and Karl H. Hasenstein}
}
@book {161,
	title = {Native American Ethnobotany},
	year = {1998},
	publisher = {Timber Press, Inc.},
	organization = {Timber Press, Inc.},
	address = {Portland, OR},
	author = {Daniel E. Moerman}
}
@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 ,}
}
@article {158,
	title = {Atlas of Pollen and Spores of the Florida Everglades},
	journal = {Palynology},
	volume = {28},
	year = {2004},
	month = {01/2004},
	pages = {175-227},
	chapter = {175},
	doi = {10.2113/28.1.175},
	author = {Debra A. Willard and Christopher E. Bernhardt and Lisa Weimer and Sherri Cooper and Desire Gamez and Jennifer Jensen}
}
@inbook {114,
	title = {Cirsium},
	booktitle = {Flora of North America},
	volume = {19},
	year = {2006},
	pages = {95-164},
	publisher = {Oxford University Press},
	organization = {Oxford University Press},
	edition = {2010},
	address = {New York, NY},
	author = {David J. Keil},
	editor = {Flora of North America Editorial Committee}
}
@booklet {115,
	title = {The PLANTS Database},
	year = {2010},
	url = {http://plants.usda.gov},
	author = {USDA, NRCS}
}
