@article {20260,
	title = {Studies of American spermatophytes - II},
	journal = { Contributions from the University of Michigan Herbarium},
	volume = {7},
	year = {1942},
	pages = {3-54},
	chapter = {3},
	url = {http://www.biodiversitylibrary.org/item/46239$\#$page/7/mode/1up},
	author = {Lundell, Cyrus L.}
}
