Nymphaea alba subsp. occidentalis

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Nymphaea alba subsp. occidentalis
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Order: Nymphaeales
Family: Nymphaeaceae
Genus: Nymphaea
Species:
N. alba
Subspecies:
N. a. subsp. occidentalis
Trinomial name
Nymphaea alba subsp. occidentalis
Synonyms [1]
  • Nymphaea alba var. occidentalis Ostenf.
  • Nymphaea occidentalis (Ostenf.) Moss

Nymphaea alba subsp. occidentalis is a subspecies of Nymphaea alba native to western and northern Europe. [1]

Contents

Description

Vegetative characteristics

Nymphaea alba subsp. occidentalis is an aquatic, rhizomatous, perennial plant. [2] The relatively small leaf [3] is 9–13 cm long. [4]

Generative characteristics

The relatively small, [2] 5–8(–12) cm wide flowers [4] do not open widely. [3] [4] [5] Stamens are absent towards the upper end of the ovary. The gynoecium consists of 8–15 carpels. [4]

Taxonomy

It was first described as Nymphaea alba var. occidentalisOstenf. by Carl Hansen Ostenfeld in 1912. It was elevated to the rank of the subspecies Nymphaea alba subsp. occidentalis(Ostenf.) Hyl. published by Nils Hylander in 1945. [1] Some sources treat it as a synonym of Nymphaea alba , [6] [7] [8] [9] [10] but others accept it as a subspecies. [11] [12] [13] [1] [14] [15] Within the subgenus Nymphaea subg. Nymphaea , it is placed in the section Nymphaea sect. Nymphaea. [7]

Etymology

The subspecific epithet occidentalis means western. [16]

Ecology

It occurs in small, nutrient poor aquatic habitats [4] in ponds, [3] marsh pools, small lakes, [12] and sheltered bays of larger lakes. [17]

Distribution

It is native to Belgium, Denmark, Finland, France, the United Kingdom, Ireland, Norway, and Sweden. [1]

Conservation

It is very rare. [2] In Sweden, it is classified as vulnerable (VU). [18] [12] In the United Kingdom, it is of national conservation concern. [19]

References

  1. 1 2 3 4 5 6 Nymphaea alba subsp. occidentalis (Ostenf.) Hyl. (n.d.). Plants of the World Online. Retrieved June 23, 2025, from https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:77251491-1
  2. 1 2 3 Nymphaea alba subsp. occidentalis (Ostenf.) Hyl., a White Water-lily. (n.d.). Botanical Society of Britain & Ireland. Retrieved June 23, 2025, from https://fermanagh.bsbi.org/nymphaea-alba-subsp-occidentalis-hyl
  3. 1 2 3 Ervik, F. (2024, November 26). Smånøkkerose. Store Norske Leksikon. Retrieved June 23, 2025, from https://snl.no/sm%C3%A5n%C3%B8kkerose
  4. 1 2 3 4 5 Schou, J. C., Moeslund, B., Weyer, K. v. d., Wiegleb, G., Lansdown, R. V., Holm, P., Baastrup-Spohr, L., Sand-Jensen, K. (2023). Aquatic Plants of Northern and Central Europe Including Britain and Ireland. pp. 62, 65. United States: Princeton University Press.
  5. ↑ Mériaux, J. L. (2003). Guide pratique de détermination des plantes aquatiques à l'état végétatif du Bassin Artois-Picardie. p. 25. Agence de l'eau Artois-Picardie.
  6. ↑ Nymphaea alba L., 1753 - Nymphéa blanc, Nénuphar blanc, Lys des étangs. (n.d.). Inventaire National Du Patrimoine Naturel. Retrieved June 23, 2025, from https://inpn.mnhn.fr/espece/cd_nom/109750/tab/taxo
  7. 1 2 USDA, Agricultural Research Service, National Plant Germplasm System. 2025. Germplasm Resources Information Network (GRIN Taxonomy). National Germplasm Resources Laboratory, Beltsville, Maryland. URL: https://npgsweb.ars-grin.gov/gringlobal/taxon/taxonomydetail?id=415688. Accessed 23 June 2025.
  8. ↑ Nymphaea alba subsp. occidentalis (Ostenf.) Hyl. (n.d.-b). GBIF | Global Biodiversity Information Facility. Retrieved June 23, 2025, from https://www.gbif.org/species/6712980
  9. ↑ Nymphaea alba L. (n.d.). Catalogue of Life. Retrieved June 23, 2025, from https://www.catalogueoflife.org/data/taxon/48696
  10. ↑ Nymphaea alba. (n.d.). Euro+Med-Plantbase. Retrieved June 23, 2025, from https://europlusmed.org/cdm_dataportal/taxon/8f1d60b9-607d-47ef-b4dd-209dc1995ee0/synonymy?highlight=fcf859c0-306f-4aa0-932f-c021fc08e9c4#fcf859c0-306f-4aa0-932f-c021fc08e9c4
  11. ↑ Nymphaea alba subsp. occidentalis (Ostenf.) Hyl. (n.d.-d). World Flora Online. Retrieved June 23, 2025, from https://stage.worldfloraonline.org/taxon/wfo-0001427180;jsessionid=8B6DA02E462CEC096002F1B4BBC8FEC4
  12. 1 2 3 Atlantnäckros Nymphaea alba subsp. occidentalis (Ostenf.) Hyl. (n.d.). SLU Artdatabanken. Retrieved June 23, 2025, from https://artfakta.se/taxa/1899/rodlistning
  13. ↑ Nymphaea alba subsp. occidentalis (Ostenf.) Hyl. (n.d.-c). NBN Atlas. Retrieved June 23, 2025, from https://species.nbnatlas.org/species/NHMSYS0000461113
  14. ↑ Nymphaea alba subsp. occidentalis. (n.d.). EPPO Global Database. Retrieved June 23, 2025, from https://gd.eppo.int/taxon/NYMAO
  15. ↑ Paul R Green, Irish Vascular Plant Data - Paul Green, National Biodiversity Data Centre, Ireland, Nymphaea alba subsp. occidentalis, accessed 23 June 2025, from https://maps.biodiversityireland.ie/Dataset/178/Species/43519
  16. ↑ Eckel, P. M. (n.d.). A Grammatical Dictionary of Botanical Latin. Missouri Botanical Garden. Retrieved June 23, 2025, from https://www.mobot.org/mobot/latindict/keyDetail.aspx?keyWord=west
  17. ↑ Mountford, O., Clarke, S., Gowing, D., Rothero, E., & Wallace, H. (2018). Meadows and more: a botanical journal of five days on the Uists, Benbecula and Eriskay. Hebridean Naturalist, 18, 72-88.
  18. ↑ ArtDatabanken 2015. Rödlistade arter i Sverige 2015. ArtDatabanken SLU, Uppsala
  19. ↑ Amphlett, A. (2013, May). The Flora of the Cairngorms National Park A Rare Plant Register. Botanical Society of the British Isles.
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