Ribbonleaf Pondweed, Ribbon-leaf Pondweed, Ribbon-leaved Pondweed
Potamogeton epihydrus
Synonyms: Potamogeton epihydrus ssp. nuttallii, Potamogeton epihydrus var. ramosus
![Ribbonleaf Pondweed, Ribbon-leaf Pondweed, Ribbon-leaved pondweed: Potamogeton epihydrus (Synonyms: Potamogeton epihydrus ssp. nuttallii, Potamogeton epihydrus var. ramosus)](epihydrus1a.jpg)
The photo above shows a close-up of ribbonleaf pondweed as seen in one of the slow-draining pools in Swampy Meadows on the western slopes of Mt. Adams...........September 6, 2008.< The submerged stem leaves are much different in shape than the floating leaves as seen here. The submerged stem leaves are long, narrow (but greater than 2 mm) and have a prominent midvein which runs their length (barely visible here).
![Ribbonleaf Pondweed, Ribbon-leaf Pondweed, Ribbon-leaved pondweed: Potamogeton epihydrus (Synonyms: Potamogeton epihydrus ssp. nuttallii, Potamogeton epihydrus var. ramosus)](epihydrus1c.jpg)
The photo above shows a close-up of the floating leaves of ribbonleaf pondweed as seen in Swampy Meadows on the western slopes of Mt. Adams..........September 6, 2008.
- ![Ribbonleaf Pondweed, Ribbon-leaf Pondweed, Ribbon-leaved pondweed: Potamogeton epihydrus (Synonyms: Potamogeton epihydrus ssp. nuttallii, Potamogeton epihydrus var. ramosus)](epihydrus1d.jpg)
Close-ups of the floating leaves of ribbonleaf pondweed as seen in Swampy Meadows on the western slopes of Mt. Adams.........September 6, 2008.
- ![](epihydrous2b.jpg)
Ribbonleaf pondweed as seen in a shallow pond in upper Muddy Meadows south of the Muddy Meadows trail...........August 28, 2012. Note the long, narrow submerged leaves and the broader floating leaves.
Paul Slichter