. . "Peter J. DeVries" . . . "2010-07-15T12:42:09-0500" . "Ceratophyllum demersum L." . . . "en" . . . "http://lod.geospecies.org/ses/Y3kuA.html" . "GeoSpecies Knowledge Base Page: Species Ceratophyllum demersum L." . . . .