Nymphaea () is a genus of hardy and tender in the family Nymphaeaceae. The genus has a cosmopolitan distribution. Many species are cultivated as , and many have been bred. Some taxa occur as introduced species where they are not native, and some are . Plants of the genus are known commonly as water lilies, or waterlilies in the United Kingdom. The genus name is from the Greek language νυμφαία, nymphaia and the Latin nymphaea, which means "water lily" and were inspired by the of Greek mythology and Roman mythology.[
]
Description
Vegetative characteristics
Water lilies are aquatic, rhizomatous or tuberous, perennial or annual herbs with sometimes desiccation-tolerant, branched or unbranched rhizomes,[ ][ which can be , or lacking stolons.][ The tuberous or fibrous roots are contractile.] The leaves are mostly floating, but submerged and emergent leaves occur as well. The shape of the lamina can be ovate, orbicular, elliptic,[ hastate,] or sagittate. The width of the lamina ranges in size from 2.5–3 cm to 40–60 cm. The lamina has a deep sinus and the basal lobes can be overlapping or divergent.[ The margin of the lamina can be entire, dentate,] or sinuate. The leaves can be stipule, or exstipulate. The petioles are a few centimetres to 5–6 m long, and 0.3–1.9 cm wide.
Generative characteristics
The flowers are emergent, floating,[ or rarely submerged.] The diurnal or nocturnal,[ Chasmogamy or rarely Cleistogamy,] solitary, hermaphrodite, entomophilous, fragrant or inodorous flowers are mostly protogynous. The flowers have (3–)4(–5) green, sometimes spotted sepals, and about 6–50 lanceolate to spathulate, differently coloured petals, which are often gradually transitioning into the shape of the stamens.[ The gap between petals and stamens can be present or absent.] The androecium consists of 20–750 stamens. The stamens can be petaloid or not petal-like. The gynoecium consists of 5–35 carpels. The carpels usually possess a sterile appendage. The globose, fleshy, spongy, irregularly dehiscent fruit, borne on a terete, glabrous or pubescent, curved or coiled peduncle,[ bears arillate,] globose to elliptic, hairy or glabrous seeds with a smooth surface or longitudinal ridges. Proliferating pseudanthia or tuberous flowers (i.e., sterile, branching, proliferating floral structures for vegetative propagation) can be present or absent.
Cytology
Various ploidy levels have been observed in Nymphaea: 2x, 3x, 4x, 6x, 8x, and 16x. The chromosome count ranges from 28 to 224.
Taxonomy
The genus Nymphaea L. was described by Carl Linnaeus in 1753. It has three synonyms: Castalia Salisb. published by Richard Anthony Salisbury in 1805, Leuconymphaea Kuntze published by Otto Kuntze in 1891, and Ondinea Hartog published by Cornelis den Hartog in 1970. The type species is Nymphaea alba L.
Subgenera
The genus Nymphaea has been divided into several Subgenus:
-
Nymphaea subg. Anecphya (Casp.) Conard
-
Nymphaea subg. Brachyceras (Casp.) Conard
-
Nymphaea subg. Confluentes S.W.L.Jacobs
-
Nymphaea subg. Hydrocallis (Planch.) Conard
-
Nymphaea subg. Lotos (DC.) Conard
-
Nymphaea subg. Nymphaea (autonym)
Sections
The subgenus Nymphaea subg. Nymphaea has been divided into sections:
-
Nymphaea sect. Chamaenymphaea (Planch.) Wiersema
-
Nymphaea sect. Nymphaea (autonym)
-
Nymphaea sect. Xanthantha (Casp.) Wiersema
Species
As of January 2024, there are 65 accepted species by Plants of the World Online:
-
Nymphaea abhayana
-
Nymphaea alba
-
Nymphaea alexii
-
Nymphaea amazonum
-
Nymphaea ampla
-
Nymphaea atrans
-
Nymphaea belophylla
-
Nymphaea × borealis
-
Nymphaea caatingae
-
Nymphaea candida
-
Nymphaea carpentariae
-
Nymphaea conardii
-
Nymphaea × daubenyana
-
Nymphaea dimorpha
-
Nymphaea divaricata
-
Nymphaea elegans
-
Nymphaea elleniae
-
Nymphaea francae
-
Nymphaea gardneriana
-
Nymphaea georginae
-
Nymphaea gigantea
-
Nymphaea glandulifera
-
Nymphaea gracilis
-
Nymphaea guineensis
-
Nymphaea harleyi
-
Nymphaea hastifolia
-
Nymphaea heudelotii
-
Nymphaea immutabilis
-
Nymphaea jacobsii
-
Nymphaea jamesoniana
-
Nymphaea kakaduensis
-
Nymphaea kimberleyensis
-
Nymphaea lasiophylla
-
Nymphaea leibergii
-
Nymphaea lingulata
-
Nymphaea loriana
-
Nymphaea lotus
-
Nymphaea lukei
-
Nymphaea macrosperma
-
Nymphaea maculata
-
Nymphaea manipurensis
-
Nymphaea mexicana
-
Nymphaea micrantha
-
Nymphaea noelae
-
Nymphaea nouchali
-
Nymphaea novogranatensis
-
Nymphaea odorata
-
Nymphaea ondinea
-
Nymphaea oxypetala
-
Nymphaea paganuccii
-
Nymphaea pedersenii
-
Nymphaea potamophila
-
Nymphaea prolifera
-
Nymphaea pubescens
-
Nymphaea pulchella
-
Nymphaea rapinii
-
Nymphaea rubra
-
Nymphaea rudgeana
-
Nymphaea siamensis
-
Nymphaea stuhlmannii
-
Nymphaea sulphurea
-
Nymphaea × sundvikii
-
Nymphaea tenuinervia
-
Nymphaea tetragona
-
Nymphaea thermarum
-
Nymphaea × thiona
-
Nymphaea vanildae
-
Nymphaea vaporalis
-
Nymphaea violacea
Fossil species
Evolutionary relationships
The genus Nymphaea may be paraphyletic in its current circumscription, as the genera Euryale and Victoria have been placed within the genus Nymphaea in several studies.
Ecology
Habitat
Nymphaea occurs in freshwater,[Parveen, S., Kaur, S., Baishya, R., & Goel, S. (2022). Predicting the potential suitable habitats of genus Nymphaea in India using MaxEnt modeling. Environmental Monitoring and Assessment, 194(12), 853.] as well as brackish water habitats.
Pollination
Flowers of Nymphaea subg. Hydrocallis are pollinated by Cyclocephala beetles. Likewise, beetle pollination by Ruteloryctes morio, a member of the same Cyclocephalini tribe, has been reported in Nymphaea subg. Lotos. The subgenera Nymphaea subg. Anecphya and Nymphaea subg. Brachyceras are pollinated by bees and flies. The subgenus Nymphaea subg. Nymphaea is pollinated by bees, flies and beetles.
Herbivory
Many birds feed on seeds and fruits of Nymphaea.
Invasive species
Outside of its natural habitat, Nymphaea mexicana and hybrids thereof have become invasive weeds.[Reid, M. K., Naidu, P., Paterson, I. D., Mangan, R., & Coetzee, J. A. (2021). Population genetics of invasive and native Nymphaea mexicana Zuccarini: Taking the first steps to initiate a biological control programme in South Africa. Aquatic Botany, 171, 103372.][Reid, M. K., Sutton, G. F., Coetzee, J. A., Gettys, L. A., & Hill, M. P. (2024). Distribution and host preference of a potential biocontrol agent with a new association for the alien water lily Nymphaea mexicana in South Africa. African Journal of Aquatic Science, 49(2), 132-144.][Reid, M. K., Paterson, I. D., Coetzee, J. A., Gettys, L. A., & Hill, M. P. (2023). Know thy enemy: Investigating genetic contributions from putative parents of invasive Nymphaea mexicana hybrids in South Africa as part of efforts to develop biological control. Biological Control, 184, 105291.] It has been proposed to employ the weevil species Bagous longulus as a biocontrol agent against Nymphaea mexicana in South Africa. Invasive horticultural hybrids can pose a threat to Nymphaea species through introgressive hybridisation.[Yakandawala, D., & Yakandawala, K. (2011). Hybridization between native and invasive alien plants: an overlooked threat to the biodiversity of Sri Lanka. Ceylon Journal of Science (Biological Sciences), 40(1).] The naturalised hybrids can displace native species and mask their disappearance, as it can be difficult to distinguish between species and naturalised hybrids.[Nierbauer, K. U., Kanz, B., & Zizka, G. (2014). The widespread naturalisation of Nymphaea hybrids is masking the decline of wild-type Nymphaea alba in Hesse, Germany. Flora-Morphology, Distribution, Functional Ecology of Plants, 209(2), 122-130.][Yakandawala, D., Guruge, S., & Yakandawala, K. (2017). The identity of the violet flowered water lily (Nymphaeaceae) and its hybrid origin in the wetland ecosystems of Sri Lanka. Journal of the National Science Foundation of Sri Lanka, 45(2).]
Conservation
Several species are in danger of extinction. Nymphaea thermarum is classified as critically endangered (CR), Nymphaea loriana is classified as endangered (EN), Nymphaea stuhlmannii is classified as endangered (EN), and Nymphaea nouchali var. mutandaensis is also classified as endangered (EN).
Use
Horticulture
Water lilies are not only decorative, but also provide useful shade which helps reduce the growth of algae in ponds and lakes. Many of the water lilies familiar in are hybrids and . These cultivars have gained the Royal Horticultural Society's Award of Garden Merit:
-
'Escarboucle'
(orange-red)
-
'Gladstoniana'
(double white flowers with prominent yellow stamens)
-
'Gonnère'
(double white scented flowers)
-
'James Brydon;'
(cupped rose-red flowers)
-
'Marliacea Chromatella'
(pale yellow flowers)
-
'Pygmaea Helvola'
(miniature, with cupped fragrant yellow flowers)
Food
All water lilies are poisonous and contain an alkaloid called nupharin in almost all of their parts.[Chapter 10 Nuphar Alkaloids. J.T. Wróbel, The Alkaloids: Chemistry and Physiology, 1967, Volume 9, Pages 441–465, ]
In India, it has mostly been eaten as a famine food or as a medicinal (both cooked).
In Sri Lanka it was formerly eaten as a type of medicine and its price was too high to serve as a normal meal, but in the 1940s or earlier some villagers began to grow water lilies in the left uncultivated during the monsoon season (Yala season), and the price dropped. The tubers are called manel here and eaten boiled and in curries.[
]
In West Africa, usage varied between cultures, in the Upper Guinea the rhizomes were only considered famine foods - here the tubers were either roasted in ashes, or dried and ground into a flour. The Buduma people ate the seeds and rhizomes. Some tribes ate the rhizomes raw.
The Hausa people of Ghana, Nigeria and the people of Southern Sudan used the tubers of Nymphaea lotus, the seeds (inside the tubers) are locally referred to as 'gunsi' in Ghana. They are ground into flour.
The plants were also said to be eaten in the Philippines. In the 1950s there were no records of leaves or flowers being eaten.
In a North American species, the boiled young leaves and unopened flower buds are said to be edible. The seeds, high in starch, protein, and oil, may be popped, parched, or ground into flour. Potato-like tubers can be collected from the species N. tuberosa (= Nymphaea odorata).
Water lilies were said to have been a major food source for a certain tribe of indigenous Australians in 1930, with the flowers and stems eaten raw, while the "roots and seedpods" were cooked either on an open fire or in a ground oven.[McConnel, U. H. 1930. ‘The Wik-Munkan Tribe of Cape York Peninsula’. Oceania 1: 97–108]
Other uses
Tannins extracted from rhizomes are used in dyeing wool a purple-black or brown colour. The peduncles are used as pipes to smoke tobacco.
Culture
The Ancient Egyptians used the water lilies of the Nile as cultural symbols. Since 1580 it has become popular in the English language to apply the Latin word Lotus tree, originally used to designate a tree, to the water lilies growing in Egypt, and much later the word was used to translate words in Indian texts. The lotus motif is a frequent feature of temple column architecture.
In Egypt, the lotus, rising from the bottom mud to unfold its petals to the sun, suggested the glory of the sun's own emergence from the Primeval soup. It was a metaphor of creation. It was a symbol of the fertility gods and goddesses as well as a symbol of the upper Nile as the giver of life.[
]
A Ancient Rome belief existed that drinking a liquid of crushed Nymphaea in vinegar for 10 consecutive days turned a boy into a eunuch.[Marcellus Empiricus, De medicamentis 33.64; compare Pliny the Elder, Natural History 25.75 (37). "There is an herb called nymphaea in Greek, 'Hercules’ club' in Latin, and baditis in Gaulish. Its root, pounded to a paste and drunk in vinegar for ten consecutive days, has the astonishing effect of turning a boy into a eunuch."]
A Syrian terra-cotta plaque from the 14th–13th centuries BC shows the goddess Asherah holding two lotus blossoms. An ivory panel from the 9th-8th centuries BC shows the god Horus seated on a lotus blossom, flanked by two .[Dever, W. G. Did God have a Wife? Archeology and Folk Religion in Ancient Israel. Wm. B. Eerdmans Publishing Co. 2008. pp 221, 279.]
The french art Impressionist Painting Claude Monet is known for his many paintings of water lilies in the pond in his garden at Giverny.
N. nouchali is the national flower of Bangladesh and Sri Lanka.
Water lilies are also used as ritual narcotics. According to one source, this topic "was the subject of a lecture by William Emboden given at Nash Hall of the Harvard Botanical Museum on the morning of April 6, 1979".
Examples
File:Nymphaea alba2006-07-06.jpg| Nymphaea alba
File:Nymphaea-colorata 0122a.jpg| Nymphaea nouchali var. zanzibariensis
File:Nymphaeales - Nymphaea gigantea 14.jpg| Nymphaea gigantea
File:Nymphaea nouchali5.JPG| Nymphaea nouchali
File:Attraction.jpg| Nymphaea 'Attraction'
File:Nymphaea Laydekeri Purpurata.jpg| Nymphaea 'Laydekeri Purpurata'
File:Nymphaea mexicana (25) 1200.jpg| Nymphaea mexicana
File:Nymphaea capensis (14) 1200.jpg| Nymphaea nouchali var. caerulea
File:Unknown Australian waterlily.jpg| Nymphaea sp.
Daubeny's water lily at BBG (50824).jpg| Nymphaea × daubenyana
See also
-
Albert de Lestang, propagator and seed collector
-
List of plants known as lily
External links
Further reading