Littorella – Chi Littorella

    0
    32
    Littorella - Chi Littorella Littorella genus freshwater aquarium plants 600 x 600
     
    Đánh giá bài này

    Littorella

    From Wikipedia, the free encyclopedia
     
     
    Littorella
    Littorella uniflora.jpeg  Littorella - Chi Littorella 220px Littorella uniflora
    Scientific classification
    Kingdom: Plantae
    (unranked): Angiosperms
    (unranked): Eudicots
    (unranked): Asterids
    Order: Lamiales
    Family: Plantaginaceae
    Genus: Littorella
    (L.) Asch.
    Species
    L. uniflora
    L. americana
    L. australis

    Littorella is a genus of two[1] to three[2] species of aquatic plants. Many plants live their entire lives submersed, and reproduce by stolons, but some are only underwater for part of the year, and flower when they are not underwater.[2]

    Contents

    • 1Classification
    • 2Species
    • 3Distribution
    • 4References
    • 5External links

    Classification

    Molecular data show Littorella to be sister to the rest of the genus Plantago. Thus, cladistics would allow it to be considered either as a separate genus or as part of Plantago.[2][3] Some researchers, particularly Rahn in the 1990s, have considered Littorella to be located within Plantago, but this does not seem to be required given the molecular data and a closer look at morphology.[2]

    Species

    Littorella - Chi Littorella 220px LittorellaUniflora
     

    L. uniflora growing at the banks of a sandy pool

    • Littorella uniflora. Found in Europe from Iceland to the black sea.[2]
    • Littorella americana from northern North America.[2]
    • Littorella australis from patagonia, in southern Chile and Argentina, and the Falkland Islands[1][2]

    Some authors have treated L. uniflora and L. americana to be one species, but molecular data show L. americana to be more closely related to L. australis than it is to L. uniflora, which argues for recognizing three species. Other considerations, such as the wider range and more frequent flowering of L. uniflora, also argue for separate species. It seems likely that the genus originated in Europe and first spread to North America, and from there to South America, with both events happening in the Pleistocene or later.[2]

    Distribution

    The European species is found in a wide range of habitats, from arctic to Mediterranean. The North and South American species are found in a more limited range of temperate climates.[2]

    References

    1. ^ Jump up to:ab “Littorella L.”. Flora of Chile. pp. 125–126.
    2. ^ Jump up to:abcdefghi Ronald K. Hoggard; Paul J. Kores; Mia Molvray; Gloria D. Hoggard; David A. Broughton (2003). “Molecular systematics and biogeography of the amphibious genus Littorella (Plantaginaceae)”. American Journal of Botany. 90 (3): 429–435. doi:10.3732/ajb.90.3.429. PMID 21659136.
    3. Jump up^ Albach D. C.; Meudt H. M.; Oxelman B. (2005). “Piecing together the “new” Plantaginaceae”. American Journal of Botany. 92 (2): 297–315. doi:10.3732/ajb.92.2.297. PMID 21652407.

    External links

    • PLANTS profile