#pondweed

Pondweeds (Potamogeton sp.) in the Ellijay River, Georgia, USA

#046 - Dewlip

Longleaf Pondweed / Sargazo

Potamogeton nodosus

This plant, mainly seen as a weed throughout its range, grows in standing or slow-moving water, and is recognised by its lanceolate leaves borne on long petioles that allow the leaves to float on the surface, collecting light. Its flower spikes are reddish brown with densely packed yellow-brown flowers. 

The leaves feed many species of invertebrates, including the waterlily aphid. The plant may hybridise with other Potamogeton species, making identification sometimes difficult. 

In folk medicine, this plant is used for acne, cough, diarrhoea, dysentery, jaundice, and tuberculosis. The starchy rhizome is sometimes described as edible, but the whole plant may be considered toxic--err on the side of caution. 

Pondwood