Elymus riparius
Elymus riparius Wiegand is an accepted species name sensu FNA Ed. Comm., 2007.
Elymus riparius (Scribner & J.G. Smith) Gould nom. illeg. is a synonym (TROPICOS) of:
Elymus lanceolatus (Scribner & J.G. Smith) Gould subsp. lanceolatus, an accepted subspecies name sensu FNA Ed. Comm., 2007.