@book {1980,
	title = {The evolution and classification of flowering plants},
	year = {1968},
	publisher = {Nelson, London},
	organization = {Nelson, London},
	keywords = {CLASSIFICATION, EVOLUTION, INCOMPLETE},
	author = {Cronquist, Arthur}
}
@article {1733,
	title = {Erythronium: Comparative Phenology of Alpine and Deciduous Forest Species in Relation to Environment},
	journal = {Department of Botany,Duke University, Durham, North Carolina 27706},
	year = {1968},
	pages = {512-543},
	keywords = {INCOMPLETE, species},
	author = {Caldwell, M. H.}
}
