@article {7034,
	title = {Notes on the cultivated Compositae, 6. The coneflowers: Dracopsis, Echinacea, Ratibida, and Rudbeckia},
	journal = {Baileya},
	volume = {9},
	year = {1961},
	month = {1961///},
	pages = {67 - 93},
	author = {W.J. Dress}
}
