Burke: Nuphar polysepala vs. Nuphar

	Nuphar polysepala	Nuphar
	yellow pond lily, spatterdock	cow-lily, yellow water-lily
Habit	Aquatic, perennial herbs with thick rhizomes bearing directly the flowers and leaves.
Leaves	Leaves mostly floating, the terete petiole up to 2 m. long, the cordate blade 1-4 dm. long and about 2/3 as wide, leathery.
Flowers	Flowers solitary, showy, long-pedunculate, perfect; sepals usually 9, the outer ones leathery, greenish, and shorter than the bright yellow inner ones, which are 3.5-6 cm. long, obovate and truncate; petals 10-20, thick, lanceolate, greenish-yellow, much smaller that the sepals, nearly equaling the numerous reddish or purplish stamens; style 1; stigma 13- to 25-rayed, 2-2.5 cm. broad.
Fruits	Capsule ovoid, 5-9 cm. long, prominently ribbed

	Nuphar polysepala	Nuphar
Flowering time	May-August
Habitat	Ponds, shallow lakes, oxbows, and sluggish streams from low to middle elevations.
Distribution	Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to Northwest Territory, Alberta, and the Rocky Mountain States. [WildflowerSearch map] [BONAP county map]	[BONAP county map]
Origin	Native	Native
Conservation status	Not of concern	Not of concern
Subordinate taxa		N. polysepala
Web links	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Nuphar polysepala

Nuphar

yellow pond lily, spatterdock

cow-lily, yellow water-lily

Habit

Aquatic, perennial herbs with thick rhizomes bearing directly the flowers and leaves.

Leaves

Leaves mostly floating, the terete petiole up to 2 m. long, the cordate blade 1-4 dm. long and about 2/3 as wide, leathery.

Flowers

Flowers solitary, showy, long-pedunculate, perfect;

sepals usually 9, the outer ones leathery, greenish, and shorter than the bright yellow inner ones, which are 3.5-6 cm. long, obovate and truncate;

petals 10-20, thick, lanceolate, greenish-yellow, much smaller that the sepals, nearly equaling the numerous reddish or purplish stamens;

style 1;

stigma 13- to 25-rayed, 2-2.5 cm. broad.

Fruits

Capsule ovoid, 5-9 cm. long, prominently ribbed

Nuphar polysepala

Nuphar

Flowering time

May-August

Habitat

Ponds, shallow lakes, oxbows, and sluggish streams from low to middle elevations.

Distribution

Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to Northwest Territory, Alberta, and the Rocky Mountain States.

[WildflowerSearch map]

[BONAP county map]