Nuphar is a genus of aquatic plants in the family Nymphaeaceae, with a temperate to subarcticNorthern Hemisphere distribution. Common names include water-lily (Eurasian species; shared with many other genera in the same family), pond-lily, alligator-bonnet or bonnet lily, and spatterdock (North American species).[3]
Description
Branching rhizomes of Nuphar lutea
Upper and lower surface of Nuphar variegata leaf
Vegetative characteristics
Nuphar species are aquatic,[4] perennial, rhizomatous, heterophyllous herbs[5] with branching rhizomes,[6][5] which are not stoloniferous.[6] The rhizomes bear conspicuous leaf scars.[4] The adventitious roots grow underneath and at the side of the rhizome.[4] The leaves can be submerged, floating, or emergent.[7][4] The lamina can be ovate, elliptic,[5] orbicular, linear,[6] obovate, or lanceolate.[4] The lamina has an entire margin,[5][7] but it can be crisped in submerged leaves.[4] The long,[5] flattened, winged, or cylindrical petioles[7] can be pubescent or glabrous.[7][4]
Generative characteristics
The solitary,[4] subglobose,[8][4] diurnal,[6] pedunculate, floating[4] or emergent flowers[6] have glabrous to pubescent peduncles.[7] The flowers have 5-9(-12)[6] yellow, green or red, persistent,[7] oblong, obovate, or orbiculate sepals.[6] The numerous, oblong to spathulate petals[7] are inconspicuous[6] and hidden by the sepals.[4] The yellow or red stamens[6][8] with strap-like filaments[5] are recurved at dehiscence.[6] The monocolpate pollen grains[8] are 40–71 µm long, and 30.4–60 µm wide.[7] The gynoecium consists of 4–36[8] fused carpels.[7][5] The 0.5–5 cm wide,[4] ovoid to urceolate fruit,[5] borne on straight peduncles,[6] bears smooth, exarillate,[5] up to 6 mm long seeds.[6]
Taxonomy
The genus NupharSm. was published by James Edward Smith in 1809.[1][9] The type species is Nuphar lutea(L.) Sm.[1] The genus NupharSm. has several synonyms: NymphonaBubani published by Pietro Bubani in 1901, NenupharLink published by Johann Heinrich Friedrich Link in 1822, NymphozanthusRich. published by Louis Claude Marie Richard in 1808, and RopalonRaf. published by Constantine Samuel Rafinesque in 1837.[2] The genus has been divided into two sections: the autonymous section Nuphar sect. Nuphar with Nuphar lutea(L.) Sm. as the type species,[10] as well as the section Nuphar sect. AstylusPadgett published by Donald Jay Padgett in 1999 with Nuphar advena(Aiton) W.T.Aiton as the type species.[11][10]
The number of species in the genus is still under review.[12][13] Until the mid-20th century, some botanists treated the genus as just a single variable species (for which the European N. lutea has priority),[7][14] while some other authorities accepted about a dozen more species on the basis of traditional taxonomic standards.[6] Recent molecular work has shown that there are substantial differences between the Eurasian species (sect. Nuphar) and American species (sect. Astylus), except for North American N. microphylla which clusters with the Eurasian species.[6][4] Molecular taxonomy has shown conclusively that recognition of so few species is out of the question, and forced an increased number of recognised species; some sources list about seventy.[12] The Kew Gardens plant list includes over twenty accepted species, subspecies and varieties; it also has a similar number as yet unresolved, together with over twenty synonyms.[13]
Other presumably related fossil taxa, not belonging to the genus Nuphar, have also been described. In 2017, the abundant fossilized seeds of a water lily, known as Notonuphar, were identified in the Eocene-aged La Meseta Formation of Seymour Island, Antarctica. The seed anatomy of Notonuphar closely resembles that of Nuphar, and for this reason, both are thought to be sister genera. Notonuphar is the first relative of Nuphar known to have inhabited Gondwana, and the wide geographic separation of both genera (Notonuphar inhabited Antarctica, while all extant and extinct Nuphar species are known from the Northern Hemisphere) supports the modern range of Nuphar being a relict distribution.[45]
Etymology
The etymology of the word is: medieval Latinnuphar, from medieval Latin nenuphar, thence from Arabicnīnūfar, thence from Persiannīlūfar, thence from Sanskritnīlōtpala = blue lotus flower.[46] For botanical gender, the name is treated as feminine.[12][6]
Ecology
Habitat
Nuphar species occur in ponds, lakes, and slow-moving rivers, growing in water up to 5 metres (16 feet) deep; different species are variously adapted either to nutrient-rich waters (e.g. N. lutea) or nutrient-poor waters (e.g. N. pumila).[47]
Wetland soils are hypoxic, and this genus is known to be capable of temporary growth even in the absence of oxygen.[48] Also there can be mass flow of oxygen-containing air, entering by means of the young leaves, passing through the rhizome, and exiting through the older leaves.[49] Both of these physiological adaptations to flooding are considered typical of many wetland and aquatic plants.[50]
Like many other vigorously growing members of the Nymphaeaceae, some species of Nuphar tend to cover the water surface completely, blocking out the light and thereby killing both submerged plants and less competitive surface-growing aquatics. They also produce alkaloids that have experimentally been shown to be allelopathic, though it is not clear how relevant the compounds may be in the wild.[51]
Herbivory
Birds such as some species of ducks eat Nuphar seeds, and mammals such as beaver and coypu eat the roots of at least some species. Deer eat the flowers and young leaves,[52] and the leaves are grazed by other animals.[53][54]
Nuphar species are less generally useful as food or medicine than various species in the related water lily genus Nymphaea. Claims of the edibility or otherwise of the plant have varied wildly, which might in some cases have reflected errors and confusion, but in the light of the recognition of an increased number of species, the confusion might largely be because hitherto unrecognised species differ in their attributes.
Some species have been used by indigenous peoples.[53][54] Young shoots and leaves sometimes were cooked but might be too bitter to eat. Whether the roots may be eaten, as is widely reported, is open to doubt; some sources claim that they are too bitter, too full of tannin, or simply too poisonous to eat unsoaked, except when treated for so long that they are not viable as a famine food. All sources however, agree that ripe seeds may be popped or variously used in cookery. They then are pleasant and nutritious, but require a lot of work to harvest and strip from the fruit capsule. To some extent this may be circumvented rotting the fruit under water for three weeks or more, after which removing the seeds is easier. The rotting material however, is very unpleasant to deal with. The flower petals are said to be used in making tea, but it is not clear whether that refers to the petals proper, or to the larger and more conspicuous sepals. The leaves of some species are large enough to be of use in wrapping food, for example in cooking.[54]
Alkaloids in the genus include nupharolutine, nuphamine and nupharidine.[58] The presence of such compounds could explain some of the medicinal uses[53]
There has been growing interest in Nuphar alkaloids, their biological and pharmacological significance and their synthesis in recent decades. It has been speculated that these and other bioactive compounds might be related to some of the folk-medical applications of the plants.[59][60]
Apart from pharmaceuticals, the leaves of Nuphar are reported to contain sufficient concentrations of tannin to have been widely used for tanning and dyeing leather, and also as a styptic for staunching bleeding.[52] The roots of some species also contain sufficient tannin to have been used for tanning.[54]
^ abcdefghijBeal, E. O. (1956). "Taxonomic revision of the genus Nuphar Sm. of North America and Europe". Journal of the Elisha Mitchell Scientific Society. 72: 317–346.
^Sibthorp, John, & Smith, James Edward. (1806). Florae Graecae prodromus; sive Plantarum omnium enumeratio (Vol. 1, p. 361). Typis Richardi Taylor, veneunt apud J. White. https://www.biodiversitylibrary.org/page/6114770
^ abDeVore, ML; Taylor, W; Pigg, KB (2015). "Nuphar carlquistii sp. nov. (Nymphaeaceae): A Water Lily from the Latest Early Eocene, Republic, Washington". International Journal of Plant Sciences. 176 (4): 365–377. doi:10.1086/680482. S2CID84149074.
^Keddy, P.A. (2010). Wetland Ecology: Principles and Conservation (2nd edition). Cambridge University Press, Cambridge, UK. ISBN9780521739672
^Elakovich, S.D.; Yang, Jie (1966). "Structures and allelopathic effects of Nuphar alkaloids: Nupharolutine and 6,6'-dihydroxythiobinupharidine". Journal of Chemical Ecology. 22 (12): 2209–2219. doi:10.1007/bf02029541. PMID24227298. S2CID12920129.
^ abErvik, F., Renner, S. S., & Johanson, K. A. (1995). Breeding system and pollination of Nuphar luteum (L.) Smith (Nymphaeaceae) in Norway. Flora, 190(2), 109-113.
^Lippok, B., & Renner, S. S. (1997). Pollination of Nuphar (Nymphaeaceae) in Europe: flies and bees rather than Donacia beetles. Plant systematics and evolution, 207, 273-283.
^Polya, Gideon Maxwell. Biochemical targets of plant bioactive compounds: a pharmacological reference guide to sites of action and biological effects, Taylor & Francis, 2003, ISBN0-415-30829-1
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