Catalogue no.:	V-1110189
Taxon:	Potamogeton gramineus x perfoliatus
Label:	Potamogeton nigrescens
Family:	Potamogetonaceae
Collector:	C.P. Laestadius
Exsiccate:	Fries, Herb. norm. pl. Suec. 16:66
Country:	Sweden
Landskap:	Torne lappmark
Socken:	Karesuando
Locality:	Lappon. Tornensis. Karesuando
Remarks:	E descr. P. lanceolatus Sm., qui vero varia interpretione dubius factus. Caule simplici, foliis omnibus conformibus membranaceis, natantibus sparsis (nec rosulatus) etc. P. rufescenti proximus