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NYMPHAEACEAE WATERLILY FAMILY

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

NYMPHAEA WATERLILY, WATER-NYMPH
Rhizomes prostrate to erect, branched or not, stoloned or not. Leaf: blade generally floating, elliptic to round, basal lobes generally ± acute. Flower: sepals < petals, ± green; petals 8–many, white, ± red, [blue], or yellow; stamens many, attached to ovary side, erect to ascending at dehiscence, outer filaments flat, petal-like or not, inner linear; ovary < stamens. Seed: ± spheric to elliptic, arilled.
± 50 species: ± worldwide. (Greek: water nymph) [Woods et al. 2005 Syst Bot 30:471–480] Plants of both California taxa problematic weeds in waterways.

Key to Nymphaea

N. mexicana Zucc. YELLOW or BANANA WATERLILY
NATURALIZED
Rhizomes erect, unbranched. Leaf: blade 7–14(18) cm wide, ovate to ± round. Flower: 6–11 cm wide, floating or emergent; sepals, petals lanceolate to narrow-elliptic; petals 12–30; outer stamens generally 2–2.5 cm, inner anthers 4–6 mm; styles 7–9. Fruit: 2–2.5 cm, ovoid. Seed: 4–5 mm.
2n=56. Lakes, ponds, slow streams; < 100 m. San Joaquin Valley; native to southeastern United States, Mexico. California plants referred to this sp. may be instead belong to Nymphaea ×thiona D.B. Ward, a natural hybrid between Nymphaea mexicana and Nymphaea odorata. Apr–Jul {Noxious weed} [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Sep 2 2014
Citation for this treatment: [Author of taxon treatment] 2013. Nymphaea, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=34797, accessed on Sep 2 2014

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Geographic subdivisions indicated for the distribution of Nymphaea mexicana 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.
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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.