Jepson eFlora: Taxon page
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Nuphar polysepala

Higher Taxonomy
Family: NymphaeaceaeView DescriptionDichotomous Key

Habit: Perennial herb, aquatic, rhizomed, stoloned or not; herbage with air chambers. Leaf: alternate, from rhizome; blades floating, submersed, or +- emergent, << petiole, +- deeply notched at base into 2 lobes [peltate]. Inflorescence: 1-flowered, axillary; peduncle long. Flower: bisexual, generally on or above water; sepals 4--14, free, petal-like or not; petals many [(0)], stamen-like or not; stamens many, attached to receptacle or ovary side, filaments generally wide; ovary compound, superior to inferior, chambers 3--many, many-ovuled, stigmas in radiating lines on stigmatic disk. Fruit: berry-like, +- dehiscent or not, spongy.
Genera In Family: 5 genera, +- 70 species: +- worldwide.
eFlora Treatment Author: John H. Wiersema
Scientific Editor: Thomas J. Rosatti.
Genus: NupharView Description 

Habit: Rhizomes prostrate, branched, not stoloned. Leaf: blade generally ovate to round. Flower: sepals persistent; petals 10--20, stamen-like, thick, oblong to thin, spoon-shaped; stamens many, generally yellow, attached to receptacle, erect to incurved at dehiscence; ovary > stamens. Seed: ovoid, not arilled.
Species In Genus: +- 8 species: northern temperate. Etymology: (Arabic name)

Nuphar polysepala Engelm.
Leaf: blade generally floating, 1--4 dm, oblong to ovate, basal lobes generally +- rounded. Flower: 5--10 cm wide; sepals 7--9(12), < 5 cm, ovate to wide-obovate, green or yellow-green, red-tinged or not; petals, stamens yellow, red-tinged or not; stigmatic disk 2--3.5 cm wide. Seed: 3--5 mm. Chromosomes: 2n=34.
Ecology: Ponds, slow streams; Elevation: < 2500 m. Bioregional Distribution: NW, CaRH, n&c SN, GV, n&c CW, MP; Distribution Outside California: to Alaska, Rocky Mountains. Flowering Time: Apr--Sep
Synonyms: Nuphar lutea (L.) Sm. subsp. polysepala (Engelm.) E.O. Beall; Nymphaea polysepala (Engelm.) Greene
eFlora Treatment Author: John H. Wiersema
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botanical illustration including Nuphar polysepala


Citation for this treatment: John H. Wiersema 2016. Nuphar polysepala, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 01, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 01, 2016.

Nuphar polysepala
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© 2009 Julie Kierstead Nelson
Nuphar polysepala
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© 2005 Steve Matson
Nuphar polysepala
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© 2005 Steve Matson
Nuphar polysepala
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© 2010 Keir Morse
Nuphar polysepala
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© 2013 California Academy of Sciences
Nuphar polysepala
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© 2009 Barry Breckling

More photos of Nuphar polysepala in CalPhotos

Geographic subdivisions for Nuphar polysepala:
NW, CaRH, n&c SN, GV, n&c CW, MP;
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.