''Nymphaea'' × ''borealis'' is a species of waterlily native to Sweden, Poland, Germany,
the Netherlands,
[Haveman, R., Jager, H., & de Ronde, I. (2018)]
Een echo uit een koud verleden: het Nymphaeetum candidae Miljan 1958 in Nederland.
Stratiotes, 52, 5-31. the Czech Republic, and East European Russia.
It is a natural hybrid of ''
Nymphaea alba
''Nymphaea alba'', the white waterlily, European white water lily or white nenuphar , is an aquatic flowering plant in the family Nymphaeaceae. It is native to North Africa, temperate Asia, Europe and tropical Asia (Jammu and Kashmir).
Since '' ...
'' and ''
Nymphaea candida''.
Description
Vegetative characteristics
The primary leaf nervation of the basal lobes is slightly arched.
[Langbehn, H. (2010)]
Die Seerosen im Norden des Landkreises Celle.
Floristische Notizen aus der Lüneburger Heide, 18, 19-24.
Generative characteristics
The floral base is tetragonous.
The filament is lanceolate.
The gynoecium consists of 14–18 carpels.
The slightly concave, yellow stigmatic disk
has a hemispherical, short projection in the centre.
Cytology
It exhibits an intermediate genome size.
[Dąbrowska, M., Skubała, K., Volkova, P., Suda, J., & Zalewska-Gałosz, J. (2015)]
"Genome size and phenotypic variation of ''Nymphaea'' (Nymphaeaceae) species from Eastern Europe and temperate Asia."
Acta Societatis Botanicorum Poloniae, 84(2).
Reproduction
Generative reproduction
''Nymphaea'' × ''borealis'' exhibits lower fertility and pollen production.
Natural hybridisation
''Nymphaea'' × ''borealis'' can be formed in areas of
sympatric
In biology, two closely related species or populations are considered sympatric when they exist in the same geographic area and thus frequently encounter each other. An initially interbreeding population that splits into two or more distinct spe ...
occurrence of the parent species, but the natural hybridisation of both parent species is not very frequent. Genetically confirmed hybrids are a rare occurrence.
[Kabatova, K., Vit, P., & Suda, J. (2014)]
"Species boundaries and hybridization in central-European ''Nymphaea'' species inferred from genome size and morphometric data."
Preslia, 86(2), 131-154.
Taxonomy
It was first described by
Edmond Gustave Camus
Edmond Gustave Camus (1852 – 22
August 1915) was a French pharmacist and botanist known for his work with orchids.
A pharmacist by vocation, he was a resident of L'Isle-Adam, Val-d'Oise, L'Isle-Adam, a community near Paris. He was the father of ...
in 1898.
Etymology
The hybrid name ''borealis'' means north or northern.
[A Grammatical Dictionary of Botanical Latin. (n.d.). Missouri Botanical Garden. Retrieved May 26, 2025, from https://www.mobot.org/mobot/latindict/keyDetail.aspx?keyWord=borealis]
Ecology
It is a host plant to the phytopathogenic fungus species ''
Rhamphospora nymphaeae''.
[Kruse, J. (n.d.). ''Rhamphospora nymphaeae''. (Obligat) Phytoparasitische Kleinpilze. Mitteleuropa Mit Schwerpunkt Deutschland. Retrieved May 29, 2025, from https://www.phytoparasiten.de/rhamphospora-nymphaeae/]
References
{{Taxonbar, from=Q17253167
borealis
Flora of Sweden
Flora of the Netherlands
Flora of Poland
Flora of Germany
Flora of Russia
Flora of the Czech Republic
Flora of Europe
Plants described in 1898
Plant nothospecies