@book {3423,
	title = {Flora Boreali-Americana, Vol. 2},
	year = {1840},
	month = {1840///},
	pages = { - 48},
	author = {Hooker, W. J.}
}
@article {3397,
	title = {Voyria acuminata},
	journal = {The Journal of Botany},
	volume = {2},
	year = {1840},
	month = {1840///},
	pages = { - 46},
	author = {Bentham, G.}
}
@article {2759,
	title = {Observationes de Voyria},
	journal = {Tijdschr. Natuurk. Gesch. Physiol.},
	volume = {7},
	year = {1840},
	month = {1840///},
	pages = {129 - 139},
	author = {Splitgerber, F. L.}
}
