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John H. Wiersema

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.
5 genera, ± 70 species: ± worldwide. [Wiersema & Hellquist 1997 FNANM 3:66–77] —Scientific Editor: Thomas J. Rosatti.

Key to Nymphaeaceae

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.
± 8 species: northern temperate. (Arabic name) [Padgett 2007 Rhodora 109:1–95]
Unabridged references: [Padgett et al. 1999 Amer J Bot 86:1316–1324]

N. 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.
2n=34. Ponds, slow streams; < 2500 m. Northwestern California, High Cascade Range, n&c Sierra Nevada, Great Central Valley, n&c Central Western California, Modoc Plateau; to Alaska, Rocky Mountains. [Nuphar lutea (L.) Sm. subsp. polysepala (Engelm.) E.O. Beall; Nymphaea polysepala (Engelm.) Greene] Apr–Sep [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Dec 1 2015
Citation for this treatment: [Author of taxon treatment] 2013. Nuphar, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Dec 1 2015

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Geographic subdivisions indicated for the distribution of Nuphar polysepala 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.