@book {578,
	title = {Das Pflanzenreich. Regni vegetabilis conspectus. IV. II. Potamogetonaceae},
	year = {1907},
	pages = {184},
	publisher = {Verlag von Wilhelm Engelmann},
	organization = {Verlag von Wilhelm Engelmann},
	edition = {Engler, A.},
	address = {Leipzig},
	author = {Ascherson, P. and Graebner, P.}
}
