@book {8515,
	title = {The genus Bidens},
	year = {1937},
	month = {1937///},
	publisher = {Publ. Field Mus. Nat. Hist., Bot. Ser. 16},
	organization = {Publ. Field Mus. Nat. Hist., Bot. Ser. 16},
	author = {E.E. Sherff}
}
