Potamogeton ×angustifolius

Potamogeton gramineus × P. lucens – rdest světlý × r. trávolistý
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Habitus and growth type

  • Height [m]: 0.2–1.2
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  • Life form: hydrophyte
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Leaf

  • Leaf presence and metamorphosis: leaves present, not modified
    ?
  • Stipules: present
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  • Petiole: both present and absent
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  • Leaf anatomy: hydromorphic
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Flower

  • Flowering period [month]: June–August
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  • Flower colour: green
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  • Perianth type: homochlamydeous
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  • Inflorescence type: spica
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  • Dicliny: synoecious
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  • Pollination syndrome: wind-pollination, water-pollination
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Fruit, seed and dispersal

  • Reproduction type: by seed/spores and vegetatively
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Belowground organs and clonality

  • Shoot metamorphosis: stolon, turion
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  • Storage organ: stolon, turion
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  • Type of clonal growth organ: turion
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  • Freely dispersible organs of clonal growth: present
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  • Shoot life span (cyclicity): monocyclic shoots prevailing
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  • Branching type of stem-derived organs of clonal growth: sympodial
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  • Primary root: absent
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  • Persistence of the clonal growth organ [year]: 1
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  • Number of clonal offspring: 3.5
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  • Lateral spreading distance by clonal growth [m]: 0.13
    ?
  • Clonal index: 7
    ?
  • Bud bank

    ?
  • Number of buds per shoot at the soil surface (root buds excluded): 5
  • Number of buds per shoot at a depth of 0–10 cm (root buds excluded): 10
  • Number of buds per shoot at a depth greater than 10 cm (root buds excluded): 0
  • Size of the belowground bud bank (root buds excluded): 15
  • Depth of the belowground bud bank (root buds exluded) [cm]: 4
  • Number of buds per shoot at the soil surface (root buds included): 5
  • Number of buds per shoot at a depth of 0–10 cm (root buds included): 10
  • Number of buds per shoot at a depth greater than 10 cm (root buds included): 0
  • Size of the belowground bud bank (root buds included): 15
  • Depth of the belowground bud bank (root buds included) [cm]: 4

Trophic mode

  • Parasitism and mycoheterotrophy: autotrophic
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  • Carnivory: non-carnivorous
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  • Symbiotic nitrogen fixation: no nitrogen-fixing symbionts
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Taxon origin

  • Origin in the Czech Republic: native
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Habitat and sociology

  • Affinity to the forest environment

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  • Affinity to the forest environment in Thermophyticum: 0 – taxon that does not spontaneously occur in Czech forests
  • Affinity to the forest environment in Mesophyticum and Oreophyticum: 0 – taxon that does not spontaneously occur in Czech forests
  • Diagnostic taxon

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  • Diagnostic taxon of associations: VBB13 Potametum zizii
  • Constant taxon

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  • Constant taxon of associations: VBB13 Potametum zizii
  • Dominant taxon

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  • Dominant taxon of associations: VBB13 Potametum zizii

Distribution and frequency

  • Floristic zone: northern temperate, southern temperate, submeridional
    ?
  • Floristic region: Europe, Western Siberia
    ?
  • Elevational belt in the Czech Republic: lowlands, colline belt, submontane belt
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  • Occurrence frequency in the basic grid mapping cells and quadrants of the basic grid mapping cells: 29, 41
    ?

Threats and protection

  • Red List 2017 (national categories): C1t – critically threatened taxon, declining
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  • Red List 2017 (IUCN categories): CR – critically endangered
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