[The Pondweeds of Mt. Adams and Vicinity]

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)

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)

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) - Ribbonleaf Pondweed, Ribbon-leaf Pondweed, Ribbon-leaved pondweed: Potamogeton epihydrus (Synonyms: Potamogeton epihydrus ssp. nuttallii, Potamogeton epihydrus var. ramosus)

Close-ups 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) -

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