Lagenandra – Chi Lagenandra

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

    Species from this Genus – Các cây trong Chi này:

    Lagenandra

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    Lagenandra
    Lagenandra ovata i koenigii DPR.png  Lagenandra - Chi Lagenandra 220px Lagenandra ovata i koenigii DPR
    Lagenandra ovata (left) and
    Lagenandra koenigii (right)[1]
    Scientific classification
    Kingdom: Plantae
    (unranked): Angiosperms
    (unranked): Monocots
    Order: Alismatales
    Family: Araceae
    Subfamily: Aroideae
    Tribe: Cryptocoryneae
    Genus: Lagenandra
    Dalzell

    Lagenandra is a genus of flowering plants in the Araceae family.[2] It is endemic to the Indian Subcontinent (Bangladesh, Sri Lanka, and India).[3][4] The genus is similar to Cryptocoryne, but can be distinguished from it by its involute vernation. Cryptocoryne on the other hand exhibit convolute vernation.[5]

    Description

    Helophytes, rarely rheophytes, with thick creeping rhizome; leaf blade simple, ovate to almost linear, fine venation transverse-reticulate; spathe tube with connate margins; spadix entirely enclosed in spathe tube; flowers unisexual, perigone absent. Differs from Cryptocoryne in having female flowers spirally arranged (pseudo-whorl in Lagenandra nairii, whorled in Lagenandra gomezii) and free; spathe tube “kettle” with connate margins (containing spadix) occupying entire spathe tube; spathe blade usually opening only slightly by a straight or twisted slit; berries free, opening from base; leaf ptyxis involute.[6]

    Species

    Accepted species are as follows.[3] A key to the species described before 1986 was provided by Crusio and de Graaf.[7]

    1. Lagenandra bogneri de Wit – Sri Lanka
    2. Lagenandra dewitii Crusio & de Graaf – Sri Lanka
    3. Lagenandra erosa de Wit – Sri Lanka
    4. Lagenandra gomezii (Schott) Bogner & Jacobsen – Bangladesh
    5. Lagenandra jacobseni de Wit – Sri Lanka
    6. Lagenandra keralensis Sivadasan & Jaleel – Kerala
    7. Lagenandra koenigii (Schott) Thwaites – Sri Lanka
    8. Lagenandra lancifolia (Schott) Thwaites – Sri Lanka
    9. Lagenandra meeboldii (Engler) C.E.C. Fischer – southwestern India
    10. Lagenandra nairii Ramamurthy & Rajan – southwestern India
    11. Lagenandra ovata (L.) Thwaites – southwestern India, Sri Lanka
    12. Lagenandra praetermissa de Wit & Nicolson – Sri Lanka
    13. Lagenandra thwaitesii Engler – Sri Lanka
    14. Lagenandra toxicaria Dalzell – southwestern India
    15. Lagenandra undulata Sastry – Assam

    References

    1. Jump up^ Pohl in Das Pflanzenreich of Engler – “Das Pflanzenreich” Vol. 73-74 (1920)
    2. Jump up^ de Wit, H.C.D. (1978). “Revisie van het genus Lagenandra Dalzell (Araceae)”. Mededelingen Landbouwhogeschool Wageningen. 78 (13): 1–45.
    3. ^ Jump up to:ab Kew World Checklist of Selected Plant Families
    4. Jump up^ Bastmeijer, Jan D. “Lagenandra gallery”. Retrieved 2009-01-09.
    5. Jump up^ Bown, Demi. Aroids: Plants of the Arum Family. Timber Press. ISBN 0-88192-485-7.
    6. Jump up^ Simon J. Mayo, Josef Bogner, Peter C. Boyce: The Genera of Araceae. 1. published, Royal Botanic Gardens/ Kew Publishing, London 1997, ISBN 1-900347-22-9 (Full-text as PDF-file; Continental Printing, Belgium 1997).
    7. Jump up^ Crusio W.E. and de Graaf A. (1986). “Lagenandra dewitii Crusio et de Graaf (Araceae), eine neue Art aus Sri Lanka”. Aqua Planta. 11: 56–59.