@article {8245,
	title = {Conspectus and notes on the genus Amaranthus in Canada},
	journal = {Rhodora},
	volume = {105},
	year = {2003},
	month = {2003///},
	pages = {260 - 281},
	author = {M. Costea and F.J. Tardif}
}
@article {8278,
	title = {Taxonomy of the most common weedy European Echinochloa species (Poaceae: Panicoideae) with special emphasis on characters of the lemma and caryopsis},
	journal = {Sida},
	volume = {20},
	year = {2002},
	month = {2002///},
	pages = {525 - 548},
	author = {M. Costea and F.J. Tardif}
}
