Jepson eFlora: Taxon page
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Nymphaea mexicana

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: NymphaeaView DescriptionDichotomous Key

Habit: 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.
Species In Genus: +- 50 species: +- worldwide. Etymology: (Greek: water nymph) Note: Plants of both California taxa problematic weeds in waterways.

Nymphaea mexicana Zucc.
Habit: 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. Chromosomes: 2n=56.
Ecology: Lakes, ponds, slow streams; Elevation: < 100 m. Bioregional Distribution: SnJV; Distribution Outside California: native to southeastern United States, Mexico. Flowering Time: Apr--Jul Note: 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.
eFlora Treatment Author: John H. Wiersema
Jepson Online Interchange
Noxious Weed

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Citation for this treatment: John H. Wiersema 2016. Nymphaea mexicana, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 06, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 06, 2016.

Geographic subdivisions for 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.
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.