Nuphar polysepala |
Nuphar orbiculata |
|
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Rocky Mountain cowlily, Rocky Mountain pond-lily, spatterdock, wakas, yellow pond-lily |
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Rhizomes | 3-8 cm diam. |
ca. 7-8 cm diam. |
Leaves | 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. |
blade abaxially and adaxially green, often suffused with purple, orbiculate or nearly so, 20-45 × 20-45 cm, 1-1.2 times as long as wide, sinus ca. 1/2 length of midrib, lobes approximate to overlapping; surfaces abaxially densely pubescent. |
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. |
4-8 cm diam.; sepals 6, abaxially green to adaxially yellow, never red-tinged toward base; petals oblong, thick; anthers 5-6 mm, longer 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. |
greenish or yellowish, cylindric to nearly globose, 3.5-5 cm, smooth basally, finely ribbed toward apex, slightly constricted below stigmatic disk; stigmatic disk green, yellow, or sometimes reddened, ca. 30-35 mm diam., undulate; stigmatic rays 12-28, linear or lanceolate, terminating 1-3 mm from margin of disk. |
Seeds | 3.5-5 mm. |
4-6 mm. |
2n | = 34. |
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Nuphar polysepala |
Nuphar orbiculata |
|
Phenology | Flowering spring (later in north)-summer. | Flowering mid spring–early fall. |
Habitat | Ponds, lakes, and sluggish streams | Acidic ponds |
Elevation | 0-3700 m (0-12100 ft) | 0-100 m (0-300 ft) |
Distribution |
AK; AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; BC; NT; YT
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AL; FL; GA |
Discussion | Plants intermediate between Nuphar polysepala and N. variegata occur in eastern British Columbia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Nuphar orbiculata is perhaps best treated as a subspecies. Plants intermediate between it and N. advena occur in southern Georgia and northern Florida. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Nymphaeaceae > Nuphar | Nymphaeaceae > Nuphar |
Sibling taxa | ||
Synonyms | N. lutea subsp. polysepala, Nymphaea polysepala | Nymphaea orbiculata, N. lutea subsp. orbiculata, Nymphaea bombycina |
Name authority | Engelmann: Trans. Acad. Sci. St. Louis 2: 282. 1865 (as polysepalum) | (Small) Standley: Publ. Field Columbian Mus., Bot. Ser. 8: 311. 1931 (as orbiculatum) |
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