Nuphar polysepala

Engelmann

Trans. Acad. Sci. St. Louis2: 282. 1865 (as polysepalum)

Synonyms: Nuphar lutea polysepala Nymphaea polysepala
Found in FNA Volume 3.
FNA03 P12 Nuphar pg 69.jpeg
Rhizomes 3-8 cm diam. Leaves mostly floating, occasionally emersed or submersed; petiole terete. Leaf blade abaxially and adaxially green, widely ovate, 10-40(-45) × 7-30 cm, ca. 1.2-1.5 times as long as wide, sinus 1/3-2/3 length of midrib, lobes divergent to overlapping; surfaces glabrous. Flowers 5-10 cm diam.; sepals mostly (6-)9(-12), abaxially green to adaxially yellow, sometimes red-tinged toward base; petals oblong, thick; anthers 3.5-9 mm, slightly shorter than filaments. Fruit green to yellow, cylindric to ovoid, 4-6(-9) × 3.5-6 cm, strongly ribbed, slightly constricted below stigmatic disk; stigmatic disk green, 20-35 mm diam., entire to crenate; stigmatic rays 8-26(-36), linear to lanceolate, terminating within 1(-1.5) mm from margin of disk. Seeds 3.5-5 mm. 2n = 34.

Phenology: Flowering spring (later in north)-summer.
Habitat: Ponds, lakes, and sluggish streams
Elevation: 0-3700 m

Distribution

B.C., N.W.T., Yukon, Alaska, Ariz., Calif., Colo., Idaho, Mont., Nev., N.Mex., Oreg., Utah, Wash., Wyo.

Discussion

Plants intermediate between Nuphar polysepala and N. variegata occur in eastern British Columbia.

References

None.

Facts about "Nuphar polysepala"
AuthorJohn. H. Wiersema + and C. Barre Hellquist +
Elevation0-3700 m +
HabitatPonds, lakes, and sluggish streams +
IllustratorJohn Myers +
PhenologyFlowering spring (later in north)-summer. +
ReferenceNone +
SynonymNuphar lutea polysepala + and Nymphaea polysepala +
Taxon nameNuphar polysepala +
Taxon parentNuphar +
Taxon rankspecies +
VolumeVolume 3 +