Dioscorea longicuspis R.Knuth
  • Notizbl. Bot. Gart. Berlin-Dahlem


Cite taxon page as 'WFO (2020): Dioscorea longicuspis R.Knuth. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0000392095. Accessed on: 08 Apr 2020'

Morphology

Seeds winged all round, 2 cm. in diameter.

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    Leaves usually opposite, occasionally alternate; petiole up to 6(–15) cm. long; blade ovate, rarely heart-shaped, with the base varying from deeply and widely cordate to subtruncate, acutely acuminate, up to 12(–14) cm. long and 7(–11) cm. broad, sparsely or densely clothed with small or longer stellate hairs, especially on the nerves, sometimes glabrescent beneath, subglabrous or with a few scattered stellate hairs above.

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    Capsule as in fig. 5/5, ± 4 cm. in diameter, glabrescent.

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    Twining stems 6 m. long or more, sparsely beset with stellate hairs, soon glabrescent.

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    Tuber replaced annually, branching at top, the branches cylindric, descending vertically, up to 60 cm. long and 10 cm. in diameter.

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    Figs. 4, p. 17, and 5.

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    Female 3(–5) per leaf-axil, up to 25 cm. long, usually much shorter; perianth erect, almost 1.5 mm. across. Ovary densely stellate-pubescent.

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    Inflorescences descending, spicate.

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    Male up to 6(–12) per leaf-axil, up to 7(–11) cm. long; flowers sessile, directed away from the axis; perianth ultimately curving outwards in flower, ± 3 mm. across; segments ovate, the inner narrower, obtuse, ± 2 mm. long.

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     Information From

    Dioscoreaceae
    World Flora Online Data. 2017.
    • A CC0 1.0 Universal (CC0 1.0).
    Plants Of the World Online Portal - FTEA
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • B
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • C CC0 1.0 Universal (CC0 1.0).
    International Union for Conservation of Nature
    https://www.iucn.org/
    IUCN 2016. IUCN Red List of Threatened Species. Version 2016-2
    • D All Rights Reserved
    International Union for Conservation of Nature v.3
    https://www.iucnredlist.org/
    IUCN 2019. The IUCN Red List of Threatened Species. Version 2019-1.
    • E See IUCN Terms and conditions of use http://www.iucnredlist.org/info/terms-of-use