Etymology: Nuphar: ultimately from the Persian word nufar
Plants: floating, perennial aquatic; from large, up to 3" thick, spongy rhizome
Leaves: most held above the water; 8"-16" long, with a rounded tip, the base arrow-shaped with a triangular notch; stalks round or oval
Flowers: yellow, 7 or more-parted, 2" wide, cup-shaped, 6 sepals, opening during the day and closing at night; solitary; blooms June-Aug.
Habitat: sun, shade; ponds, streams, water less than 7' deep; in sediment soil
Conservation Status: Special Concern
Flora of North America: Flora of North America Floristic Rating: Coefficient of Conservatism = 8 WIS DNR-Bureau of Endangered Resources: Detailed information on Wisconsin listed species including state and federal status, photos, etc. USDA Plants Database: Federal Distribution and detailed information including photos David G. Smith's "Delaware Wilflowers": Beautiful photographs; descriptions Southwest School of Botanical Medicine: Britton & Brown Illustrated Flora - 2nd Edition (1913) "An Illustrated Flora of the Northern United States and Canada"