@article {405,
	title = {Studies in the Boraginaceae VII. The South American species of Heliotropium},
	journal = {Contributions from the Gray Herbarium of Harvard University},
	volume = {81},
	year = {1928},
	month = {1928///},
	pages = {3 - 73},
	url = {http://www.biodiversitylibrary.org/page/39600170},
	author = {Johnston, I. M.}
}
