Nuphar lutea ssp. polysepala (syn: Nuphar polysepalum)
Yellow Water Lily

Family: Nymphaeaceae (Water-lily family)

Photo taken near Stevens Pass, submerged up to 10 ft. in a small freshwater lake

Plant:

Rhizomes sliced, dried and used for food by the Thompson. Roots considered poisonous by the Okanagan-Colville. Dried, roasted, ground seeds used for porridge by the Klamath and Mendocino Indians. Powdered, dried leaves mixed with grease and used as an ointment for swellings, bites and infections by the Thompson. Infusion of mashed roots applied to back pain, rheumatism, and sores by the Shuswap.