Potamogeton crispus
There are many, many species of Potomogeton world wide, and many in the U.S. Many do not make particularly good aquarium plants, but Potamogeton crispus is rather nice. It is fast-growing, attractive and undemanding.
Common Name: Curly pond weed
Family Name: Potamogetonaceae
Native To: North America
Lighting: Low-medium
Requirements: Undemanding
Growth Form: Stem
Growth Rate: Very fast
True Aquatic: Yes
Placement in Tank: Background, or can be left floating
Available As: Bunch