Page authors: Don Knoke, David Giblin
Nuphar polysepala
yellow pond lily, spatterdock
WTU specimens
Other herbaria

Distribution: Widely distributed throughout Washington; Alaska south to northern California, east to Alberta and Colorado.

Habitat: Ponds, shallow lakes and sluggish streams.

Flowers: May-August

Origin: Native

Conservation Status: Not of concern

Description:
General:

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

Accepted Name:
Nuphar polysepala Engelm.
Publication: Trans. Acad. Sci. St. Louis. 2: 282. 1865. 1865.

Synonyms & Misapplications:
Nuphar lutea (L.) Sm., misapplied
Nuphar lutea (L.) Sm. ssp. polysepala (Endelmann) E.O. Beal [KZ99]
Nuphar polysepalum Engelm. [HC]
Additional Resources:

PNW Herbaria: Specimen records of Nuphar polysepala in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Nuphar polysepala checklist entry.

E-Flora BC: Nuphar polysepala atlas page.

CalPhotos: Nuphar polysepala photos.

USDA Plants: Nuphar polysepala information.

39 photographs:
Group by