@article {274,
	title = {Phylogeny of the Coneflowers and Relatives (Heliantheae: Asteraceae) Based on Nuclear rDNA Internal Transcribed Spacer (ITS) Sequences and Chlorplast DNA Restriction Site Data},
	journal = {Systematic Botany},
	volume = {25},
	year = {2000},
	pages = {539-565},
	chapter = {539},
	author = {Lowell E. Urbatsch and Bruce G. Baldwin and Michael J. Donoghue}
}
@inbook {204,
	title = {Rudbeckia},
	booktitle = {Flora of North America},
	volume = {21},
	year = {2006},
	author = {Lowell E. Urbatsch and Patricia B. Cox},
	editor = {Editorial Committee of Flora North America,}
}
