Betula pendula var. obscura

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Leaf

  • Leaf presence and metamorphosis: leaves present, not modified
    ?
  • Leaf arrangement (phyllotaxis): alternate
    ?
  • Leaf shape: simple – entire
    ?
  • Stipules: present
    ?
  • Petiole: present
    ?

Flower

  • Flower colour: yellow-green
    ?
  • Perianth type: homochlamydeous, reduced or absent
    ?
  • Perianth fusion: reduced
    ?
  • Inflorescence type: amentum e floribus masculis, amentum e floribus femineis
    ?

Fruit, seed and dispersal

  • Fruit type: dry fruit – achene/cypsela/samara
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  • Dispersal unit (diaspore): seed
    ?
  • Dispersal strategy: Epilobium (mainly anemochory and autochory)
    ?
  • Myrmecochory: non-myrmecochorous (b)
    ?

Trophic mode

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

Taxon origin

  • Origin in the Czech Republic: native
    ?

Ecological indicator values

  • Ellenberg-type indicator values

  • Light indicator value: 7 – half-light plant, mostly occurring at full light, but also in the shade up to about 30% of diffuse radiation incident in an open area
    ?
  • Temperature indicator value: 5x – moderate heat indicator, occurring from lowland to montane belt, mainly in submontane-temperate areas (generalist)
    ?
  • Moisture indicator value: 5x – indicator of fresh soils, focus on soils of average moisture, missing on wet and on soils that frequently dry out (generalist)
    ?
  • Reaction indicator value: 4x – transition between values 3 and 5 (generalist)
    ?
  • Nutrient indicator value: 3x – occurring at nutrient-poor sites more frequently than at average sites and exceptionally at rich sites (generalist)
    ?
  • Salinity indicator value: 0 – not salt tolerant, glycophyte
    ?

Habitat and sociology

  • Occurrence in habitats

    ?
  • 5 Vegetation of springs and mires

  • 5E Acidic moss-rich fens and peatland meadows: 1 – rare occurrence
  • 6 Meadows and mesic pastures

  • 6C Pastures and park grasslands: 1 – rare occurrence
  • 6E Wet Cirsium meadows: 1 – rare occurrence
  • 6F Intermittently wet Molinia meadows: 1 – rare occurrence
  • 7 Acidophilous grasslands

  • 7B Submontane Nardus grasslands: 1 – rare occurrence
  • 11 Heathlands and scrub

  • 11I Willow carrs: 1 – rare occurrence
  • 11R Scrub and pioneer woodland of forests clearings: 2 – optimum
  • 12 Forests

  • 12A Alder carrs: 1 – rare occurrence
  • 12B Alluvial forests: 1 – rare occurrence
  • 12C Oak-hornbeam forests: 1 – rare occurrence
  • 12K Acidophilous oak forests: 2 – optimum
  • 12L Boreo-continental pine forests: 1 – rare occurrence
  • Affinity to the forest environment

    ?
  • Affinity to the forest environment in Thermophyticum: 2.1 – taxon occurring both in the forest and open vegetation
  • Affinity to the forest environment in Mesophyticum and Oreophyticum: 2.1 – taxon occurring both in the forest and open vegetation

Distribution and frequency

  • Elevational belt in the Czech Republic: submontane belt, montane belt
    ?
  • Occurrence frequency in the basic grid mapping cells and quadrants of the basic grid mapping cells: 27, 41
    ?
  • Number of habitats with taxon occurrence in the Czech Republic

    ?
  • Number of narrow habitats in which the taxon occurs: 12
  • Number of narrow habitats in which the taxon has its optimum: 2
  • Number of broad habitats in which the taxon occurs: 5
  • Number of broad habitats in which the taxon has its optimum: 2

Threats and protection

  • Red List 2017 (national categories): taxon is not on the Red List
    ?
  • Red List 2017 (IUCN categories): LC(NA) – least concern (taxon is not on the Red List)
    ?
  • Legal protection: not protected by law
    ?
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