E-Flora BC: Electronic Atlas of the Flora of British Columbia

Nuphar polysepala Engelm (Engelm.) E.O. Beal
Rocky Mountain pond-lily (spatterdock; yellow pond-lily)
Nymphaeaceae (Water-lily family)

Introduction to Vascular Plants

© Brian Klinkenberg  Email the photographer   (Photo ID #40648)

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Distribution of Nuphar polysepala
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Species Information

General:
Perennial aquatic herb from a thick large rhizome; stems thick, fleshy, submerged or emersed, 1-2 m long.
Leaves:
Floating or submerged, long-stalked, the stalks 1-2 m long, appearing alternate from the rhizome, blades heart-shaped, 10-40 cm long, 6-30 cm wide, leathery.
Flowers:
Inflorescence of solitary, large, waxy, floating flowers on long stalks arising from the rhizome; petals yellow (with reddish or greenish tinges), 10-20, smaller than the sepals and the numerous yellow or reddish-purple stamens; sepals usually 6 or 9, 2.5-6 cm long, the outer greenish and shorter than the inner yellow ones, thick.
Fruits:
Berry-like capsules, oval, leathery, rupturing irregularly; seeds numerous in a jelly-like seed mass, the seeds 4-5 mm long.
Notes:
Two species occur in BC:

1. Sepals usually 6, 2.5-3.5 cm long; stamens yellow; seeds about 5 mm long................... N. variegata (Durand) Beal

1. Sepals usually 9, (3) 3.5-6 cm long; stamens reddish or purplish; seeds about 4 mm long................... N. polysepala (Engelm.) Beal

Source: The Illustrated Flora of British Columbia

Habitat / Range

Ponds and slow-moving streams in the lowland, steppe and montane zones; ssp. polysepala - common in BC south of 55æ N, rare in NW BC; ssp. variegata - infrequent in E BC; ssp. polysepala - N to AK, YT and NT and S to SD, CO and CA, ssp. variegata - N to YT and NT, E to NF and S to DE, OH, NE, MT and N ID.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Nuphar polysepala

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class

Minimum

Average

Maximum

Elevation (metres) 1 633 1735
Slope Gradient (%) 0 0 20
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
40 93 213
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
5 7 8
Modal Nutrient Regime
Class
D
Number of field plots
 species was recorded in:
120
Modal BEC Zone Class
CWH
All BEC Zones (# of stations/zone) species was recorded in: CDF(18), CWH(61), ESSF(3), ICH(12), IDF(2), MH(1), MS(4), PP(1), SBPS(10), SBS(6)

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Nuphar lutea subsp. polysepala (L.) Sm.
Nuphar polysepalum
Nymphaea polysepala (Engelm.) Greene
Nymphozanthus polysepalus (Engelm.) Fernald

Taxonomic and Nomenclatural Links

Additional Photo Sources

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General References