Nuphar – Chi Nuphar

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    Nuphar - Chi Nuphar Nuphar genus freshwater aquarium plants 600 x 600
     
    Đánh giá bài này

    Species from this Genus – Các cây trong Chi này:

    Nuphar

    From Wikipedia, the free encyclopedia
     
     
    Nuphar
    Nuphar variegatum.jpg  Nuphar - Chi Nuphar 220px Nuphar variegatum
    Nuphar variegatum, leaves cordate
    Scientific classificatione  Nuphar - Chi Nuphar Red Pencil Icon
    Kingdom: Plantae
    Clade: Angiosperms
    Order: Nymphaeales
    Family: Nymphaeaceae
    Genus: Nuphar
    Sibth. & Sm.
    Synonyms
    • Nymphozanthus Rich. (nom. rej.)

    Nuphar is genus of aquatic plants in the family Nymphaeaceae, with a temperate to subarctic Northern 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).[1]

    Contents

     [hide] 

    • 1Etymology
    • 2Taxonomy
    • 3Species
    • 4Ecology
    • 5Use as medicine, food, and otherwise
    • 6Gallery
    • 7References

    Etymology

    The etymology of the word is: medieval Latin nuphar, from medieval Latin nenuphar, thence from Arabic nīnūfar, thence from Persian nīlūfar, thence from Sanskrit nīlōtpala = blue lotus flower.[2] For botanical gender, the name is treated as feminine.[3][4]

    Taxonomy

    Nuphar - Chi Nuphar 220px Nuphar subintegerrimum and bee

     

    Flower of Nuphar subintegerrima Makino attended by hover fly. Note the undersized petals

    Nuphar - Chi Nuphar 220px Nuphar saggitifolia

     

    Nuphar sagittifolia (Walter) Pursh, leaves sagittate

    Nuphar - Chi Nuphar 220px Nuphar lutea 02 by dpc

     

    Unripe fruit of Nuphar lutea

    The genus is closely related to Nymphaea. Nuphar differs in that its petals are much smaller than its 4-6 bright yellow-coloured sepals, whereas in Nymphaea, the petals are much larger than the sepals. The genera also differ in the maturation of their fruit; while maturing, Nuphar fruit remain above water level on their scapes, whereas fruit of Nymphaea sink below water level immediately after their flowers close, and there they mature. In both genera the leaves float and have a radial notch from the circumference to the point of attachment of the petiole. Depending on the species, the leaves of most species range from cordate to practically circular with the petiole attached in the middle, giving a peltate appearance. Some however, have modified versions of that leaf morphology; for example the leaves of Nuphar sagittifolia have leaves of an elongated sagittate form.

    The number of species in the genus is still under review.[3][5] Until the mid-20th century, some botanists treated the genus as just a single variable species (for which the European name N. lutea has priority),[6][7] while some other authorities accepted about a dozen more species on the basis of traditional taxonomic standards.[4] 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 is clusters with the Eurasian species.[4][8] 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.[3] 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.[5]

    Species

    Nuphar Section Astylus[9]

    • Nuphar advena (Aiton) W.T.Aiton –Spatterdock
    • Nuphar azarkana
    • Nuphar carlquistii DeVore, Taylor, & Pigg
    • Nuphar orbiculata
    • Nuphar polysepala Engelm.
    • Nuphar sagittifolia (Walter) Pursh
    • Nuphar ulvaca
    • Nuphar variegata Engelm. ex Durand – Variegated pond-lily

    Nuphar Section Nuphar

    • Nuphar japonica DC.
    • Nuphar lutea (L.) Sm. – Yellow water-lily (type species)
    • Nuphar microphylla
    • Nuphar pumila (Timm) DC. – Least water-lily

    There also are several interspecific hybrids.

    Ecology

    Nuphar species occur in ponds, lakes, and slow-moving rivers, growing in water up to 5 metres deep; different species are variously adaptated either to nutrient-rich waters (e.g. Nuphar lutea) or nutrient-poor waters (e.g. Nuphar pumila).[10]

    Wetland soils are hypoxic, and this genus is known to be capable of temporary growth even in the absence of oxygen.[11] 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.[12] Both of these physiological adaptations to flooding are considered typical of many wetland and aquatic plants.[13]

    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.[14]

    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 flowers and young leaves.[15]

    Use as medicine, food, and otherwise

    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.

    However, some species have been used by indigenous peoples, and the leaves are grazed by deer and other animals.[16][17] 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.[17]

    Alkaloids in the genus include nupharolutine, nuphamine and nupharidine.[18] The presence of such compounds could explain some of the medicinal uses[16]

    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.[19][20]

    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.[15] The roots of some species also contain sufficient tannin to have been used for tanning.[17]

    Gallery

    References

    Nuphar - Chi Nuphar 220px WaterlilliesKNWR

     

    “Field” of Nuphar on a small lake, Kenai National Wildlife Refuge, Alaska

    1. Jump up^ Eastman, John (2014). Wildflowers of the eastern United States (1st ed.). Mechanicsburg, PA: Stackpole Books. ISBN 978-0-8117-1367-2.
    2. Jump up^ Etymololgy of Nuphar, same as French Nenuphar (in French).
    3. ^ Jump up to:abc USDA Germplasm Resources Information Network: Nuphar
    4. ^ Jump up to:abc Wiersema, J. H.; Hellquist, C. B. (1997). “Nymphaeaceae”. Flora of North America. 3.
    5. ^ Jump up to:ab The Plant List (2013). Version 1.1. Published on the Internet; http://www.theplantlist.org/ (accessed February 2016)
    6. Jump up^ Beal, 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.
    7. Jump up^ USDA Plants Profile Nuphar
    8. Jump up^ Padgett, D. J. (2007). A Monograph of Nuphar (Nymphaeaceae). Rhodora 109: 1–95 full text.
    9. Jump up^ DeVore, 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.
    10. Jump up^ Blamey, M. & Grey-Wilson, C. (1989). Flora of Britain and Northern Europe. ISBN 0-340-40170-2
    11. Jump up^ Laing, H. E. (1940). Respiration of the rhizomes of Nuphar advenum and other water plants. American Journal of Botany 27: 574–81.
    12. Jump up^ Dacey, J. W. H. (1981). Pressurized ventilation in the yellow water lily. Ecology 62: 1137–47.
    13. Jump up^ Keddy, P.A. (2010). Wetland Ecology: Principles and Conservation (2nd edition). Cambridge University Press, Cambridge, UK.ISBN 9780521739672
    14. Jump up^ Elakovich, S.D., Jie Yang. (1966). Structures and allelopathic effects of Nuphar alkaloids: Nupharolutine and 6,6′-dihydroxythiobinupharidine. Journal of Chemical Ecology 22 (12): 2209-2219.
    15. ^ Jump up to:ab Jim Kimmel; Jerry Touchstone Kimmel (2006). The San Marcos: A River’s Story. Texas A&M University Press. pp. 92–. ISBN 978-1-58544-542-4.
    16. ^ Jump up to:ab Washington State Department of Ecology, Native Freshwater Plants. Spatterdock – A Plant With Many Uses [1]
    17. ^ Jump up to:abc Green Deane, Yellow Pond Lily
    18. Jump up^ Wrobel, J. T., Iwanow, A., Braekman-Danheux, C., Martin, T. I., & MacLean, D. B. (1972). The Structure of Nupharolutine, an Alkaloid of Nuphar luteum. Canad. J. Chem. 50: 1831–1837 full text.
    19. Jump up^ Polya, Gideon Maxwell. Biochemical targets of plant bioactive compounds: a pharmacological reference guide to sites of action and biological effects, Taylor & Francis, 2003, ISBN 0-415-30829-1
    20. Jump up^ Jimmy Wu et al. Total Syntheses and Biological Evaluation of Both Enantiomers of Several Hydroxylated Dimeric Nuphar Alkaloids†. Angewandte Chemie International Edition, July 2015 doi:10.1002/anie.201503934