These herbs have rhizomes but not turions. Tubers can be absent or present. The main difference between Stuckenia and Potamogeton is that the stipule joins the leaf base. When it is pulled the sheath and stipule comes away, similar to a grass sheath and ligule.
NRCS. "Stuckenia". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 4 December 2015. /wiki/Natural_Resources_Conservation_Service ↩