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Nymphaea lotus var. thermalis

Nymphaea lotus var. thermalis
Nymphaea lotus var. thermalis (DC.) Tuzson floating leaf with scale bar (5 cm) on a white background
Scientific classification Edit this classification
(Disputed)
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Order: Nymphaeales
Family: Nymphaeaceae
Genus: Nymphaea
Subgenus: Nymphaea subg. Lotos
Species:
N. lotus
Variety:
N. l. var. thermalis
Trinomial name
Nymphaea lotus var. thermalis
It is endemic to Romania[1]
Synonyms[1]
  • Castalia thermalis (DC.) Simonk.
  • Nymphaea thermalis DC.

Nymphaea lotus var. thermalis is a variety of Nymphaea lotus native to Romania.[1]

Description

Vegetative characteristics

Nymphaea lotus var. thermalis is an aquatic, perennial, rhizomatous plant.[2] The glabrous,[3] or pubescent,[4] sagittate, ovate,[5] or circular leaves have a dentate margin.[6] The adaxial leaf surface is dark green, and the abaxial leaf surface with prominent ribs is more pale and does not have spotting.[7]

Generative characteristics

The nocturnal,[8] fragrant,[5][7] white to pink, 12–15 cm wide flowers extend 10–12 cm over the water surface.[7] The flowers have four sepals,[5] 19–20 white petals along with yellow anthers and stamens.[9] The androecium consists of 65–80 stamens. The gynoecium consists of 24–36 carpels.[7] The fleshy, green to brown fruit bears very numerous seeds.[5] The grey,[5][2] ellipsoid, glabrous seeds with 8–14 ribs are 1.5–1.8 mm long, and 1.1–1.3 mm wide.[2]

Taxonomy

It was first described as Nymphaea thermalis DC. by Augustin Pyramus de Candolle in 1821.[10] Later, it was reduced from the species status to the variety Nymphaea lotus var. thermalis (DC.) Tuzson in 1907. In the following year another name, Castalia thermalis (DC.) Simonk., was published. The accepted name is Nymphaea lotus var. thermalis (DC.) Tuzson.[1] It is placed in the subgenus Nymphaea subg. Lotos.[11][12]

Disputation of taxonomic status

Some sources believe it is a relict, which had survived the ice age due to warm water from the thermal spring in Romania.[13] DNA analyses came to the conclusion, that Nymphaea lotus var. thermalis is not distinct from Nymphaea lotus and cannot be a relict population.[14] It was primarily separated for geographical reasons.[15] It has been described as hardly distinct.[16] It is said to differ in having glabrous leaves,[17][18][3] yet other sources state there is no difference in the leaf pubescence.[4][17] The issue of the leaf pubescence was deemed irrelevant, when it was discovered that both glabrous and pubescent leaves are present in individuals of Nymphaea lotus and Nymphaea lotus var. thermalis.[17] It has also been claimed that it differs in the dentation of the leaf margin,[17][7] but other authors have denied these claims. Likewise, it was refuted that Nymphaea lotus were not heterophyllous, which was claimed to be a distinguishing characteristic.[17] Furthermore, it was claimed that Nymphaea lotus var. thermalis flowers earlier than Nymphaea lotus. The petioles, peduncles, and calyx is said to be glabrous in Nymphaea lotus var. thermalis, supposedly unlike those of Nymphaea lotus.[10] Nymphaea lotus var. thermalis (DC.) Tuzson is treated as a synonym of Nymphaea lotus L. by some sources,[19][20] however it is still accepted by others.[21][1][22][12]

Habitat

Nymphaea lotus var. thermalis is endemic to the thermal water of the Peţa River, Sânmartin, Bihor County, Romania.[8] The area is protected as a nature reserve (51.0 hectares (126 acres) in size) and consists of a rivulet along with three ponds. The water has a roughly constant temperature of around 30 °C whilst the site has an average air temperature of 10–11 °C.[8] The thermal waters have been recorded as early as 1211, but it was only in 1799 that the first record of N. lotus was made, by Pál Kitaibel.[8][23] Janos Tuzson proposed in 1907 that this population's unusual location could be explained by the persistent heat provided by the thermal springs could have sustained the population at a pre-ice age time when the plant would have been spreading across the warmer regions of Europe; this theory was corroborated by additional evidence provided by the identification of other endemic species.[8][24]

Conservation

Alexandru Borza was the Government minister in charge of education (and also a botanist) who made the first push for legal protection and recognition of Nymphaea lotus var. thermalis – in 1932, the Cabinet of Romania declared the rivulet a nature reserve and the plant a "national monument".[8] Conservation action with the intent to preserve this population has been undertaken for many years (since at least 1940) – including the management of invasive species – and the plant has been included in recent water management legislation.[8] Whilst not held in any Romanian botanical gardens, Nymphaea lotus var. thermalis is grown at Royal Botanic Gardens Kew and at the botanic garden of Bonn University.[8] It is in imminent danger of extinction.[25]

References

  1. ^ a b c d e "Nymphaea lotus var. thermalis (DC.) Tuzson". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 10 July 2023.
  2. ^ a b c Bojnanský, V., Fargašová, A. (2007). Atlas of Seeds and Fruits of Central and East-European Flora: The Carpathian Mountains Region. p. 159. Niederlande: Springer Netherlands.
  3. ^ a b Flora Europaea: Psilotaceae to Platanaceae. p. 247. (1993). Kiribati: Cambridge University Press.
  4. ^ a b Österreichisches Botanisches Wochenblatt. p. 157. (1894). Österreich: Springer-Verlag.
  5. ^ a b c d e Riess, C. (1866). Ueber Nymphaea thermalis DC. Verhandlungen Und Mittheilungen Des Siebenbürgischen Vereins Für Naturwissenschaften in Hermannstadt, 17, 3–13.
  6. ^ Gartenflora: Zeitschrift für Garten- und Blumenkunde. p. 212. (1852). Deutschland: Deutsche Gartenbau Gesellschaft.
  7. ^ a b c d e Henkel, F., Rehnelt, F., Dittmann, L., Dittman, L. (1907). Das Buch der Nymphaeceen oder Seerosengewächse. p. 70. Deutschland: F. Henkel.
  8. ^ a b c d e f g h Veler, Ana (November 2008). "Nymphaea lotus up north, naturally". Water Gardeners International. 3 (4). Archived from the original on January 13, 2012. Retrieved 9 August 2014.
  9. ^ Courteau, Jacqueline. "Brief Summary of Nymphaea lotus L". Encyclopedia of Life. Retrieved 9 August 2014.
  10. ^ a b Candolle, Augustin Pyramus de. (1818). Regni vegetabilis systema naturale, sive Ordines, genera et species plantarum secundum methodi naturalis normas digestarum et descriptarum (Vol. 2, p. 54). sumptibus sociorum Treuttel et Würtz. https://www.biodiversitylibrary.org/page/39511854
  11. ^ 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=415657. Accessed 21 February 2025.
  12. ^ a b Nymphaea lotus var. thermalis  (DC.) Tucson. (n.d.). IWGS Plant Database. Retrieved February 23, 2025, from https://plants.iwgs.org/Home/PlantDetail?taxonID=85487
  13. ^ Blidar, C. F., Tripon, I. M., & Ilea, C. (2019). "In vitro conservation of genetic resources of Nymphaea lotus var. Thermalis (DC.) Tuzs., an endangered plant species." Romanian Biotechnological Letters, 24(3), 448-457.
  14. ^ Laczkó, L., Lukács, B. A., Mesterházy, A., Molnár, A., & Sramkó, G. (2019). "Is Nymphaea lotus var. thermalis a Tertiary relict in Europe?." Aquatic Botany, 155, 1-4.
  15. ^ Borsch, T., Hilu, K. W., Wiersema, J. H., Löhne, C., Barthlott, W., & Wilde, V. (2007). Phylogeny of Nymphaea (Nymphaeaceae): Evidence from Substitutions and Microstructural Changes in the Chloroplast trnT‐trnF Region. International Journal of Plant Sciences, 168(5), 639–671. https://doi.org/10.1086/513476
  16. ^ Shaw, J. M. H. (2011). The European Garden Flora Flowering Plants: A Manual for the Identification of Plants Cultivated in Europe, Both Out-of-Doors and Under Glass. p. 425. Vereinigtes Königreich: Cambridge University Press.
  17. ^ a b c d e Lovassy, A. (1898). Anhang zum II. Abschnitt. Die tropischen Nymphaeen des Hevizsees bei Keszthely. Resultate Der Wissenschaftlichen Erforschung Des Balatonsees, 2(2), 1–87.
  18. ^ Lawson, G. (1888). On the Nymphaeaceae.
  19. ^ Nymphaea lotus L. (n.d.). Catalogue of Life. Retrieved February 23, 2025, from http://www.catalogueoflife.org/data/taxon/486C9
  20. ^ Nymphaea lotus var. thermalis (DC.) Tuzson. (n.d.-c). GBIF | Global Biodiversity Information Facility. Retrieved February 23, 2025, from https://www.gbif.org/species/208123375
  21. ^ Nymphaea lotus var. thermalis (DC.) Tuzson. (2012, March 23). The Plant List. Retrieved February 23, 2025, from http://www.theplantlist.org/tpl1.1/record/kew-2870546
  22. ^ Nymphaea lotus var. thermalis (DC.) Tuzson. (n.d.-b). WFO Plant List. Retrieved February 23, 2025, from https://wfoplantlist.org/taxon/wfo-0000734967-2024-12?page=1
  23. ^ Waldstein, F. De Paula Adam Graf Von & P. Kitaibel (1799). "Descriptiones et icones plantarum rariorum Hungariae". Vienna. {{cite journal}}: Cite journal requires |journal= (help)
  24. ^ Tuzson, János (1907). "A Nymphaea lotus csoport morfologiája és rendszertani tagolódása". Magyar Tudományos Akadémia Matemetikai És Természettudományi Értesítője (in Hungarian).
  25. ^ Blidar, C. F., Tripon, I. M., & Ilea, C. (2017). In vitro conservation of genetic resources of Nymphaea lotus var. thermalis (DC.) Tuzs., an endangered plant species. Romanian Biotechnological Letters, 22(2017).
Quelle: http://en.wikipedia.org/wiki/Nymphaea_lotus_var._thermalis