@article {545,
	title = {Contributions from the Gray Herbarium of Harvard University},
	volume = {54},
	year = {1918},
	author = {S. F. Blake}
}
@article {410,
	title = {Rhodora; Journal of the New England Botanical Club. Cambridge, MA},
	volume = {20},
	year = {1918},
	author = {J. F. Macbride}
}
@article {133,
	title = {Bull. Soc. Bot. France},
	volume = {65},
	year = {1918},
	author = {Gandoger, M.}
}
