@inbook {7738,
	title = {Rudbeckia},
	booktitle = {Flora of North America},
	volume = {21},
	year = {2006},
	month = {2006///},
	pages = {44 - 60},
	publisher = {Oxford University Press},
	organization = {Oxford University Press},
	author = {L.E. Urbatsch and P.B. Cox},
	editor = {Committee, Flora of North America Editorial}
}
