Thesium pyrenaicum

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Habitus and growth type

  • Height [m]: 0.1–0.4
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  • Growth form: polycarpic perennial non-clonal herb
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  • Life form: hemicryptophyte
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  • Life strategy: CSR – competitor/stress-tolerator/ruderal
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  • Life strategy (Pierce method based on leaf traits): R
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  • Life strategy (Pierce method, C-score): 5.7 %
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  • Life strategy (Pierce method, S-score): 13.1 %
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  • Life strategy (Pierce method, R-score): 81.2 %
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Leaf

  • Leaf presence and metamorphosis: leaves present, not modified
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  • Leaf arrangement (phyllotaxis): alternate
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  • Leaf shape: simple – entire
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  • Stipules: absent
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  • Petiole: absent
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  • Leaf life span: summer green
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  • Leaf anatomy: mesomorphic
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Flower

  • Flowering period [month]: May–August
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  • Flowering phase: 6 Cornus sanguinea-Melica uniflora (start of early summer)
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  • Flower colour: white, green-white
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  • Flower symmetry: actinomorphic
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  • Perianth type: homochlamydeous
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  • Perianth fusion: fused
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  • Shape of the sympetalous corolla or syntepalous perianth: funnel-shaped
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  • Inflorescence type: racemus
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  • Dicliny: synoecious
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  • Generative reproduction type: mixed mating
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  • Pollination syndrome: insect-pollination, selfing
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Fruit, seed and dispersal

  • Fruit type: dry fruit – achene/cypsela/samara
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  • Reproduction type: only by seed/spores
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  • Dispersal unit (diaspore): fruit, infrutescence or its part
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  • Dispersal strategy: Allium (mainly autochory)
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  • Myrmecochory: probably myrmecochorous
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Belowground organs and clonality

  • Shoot metamorphosis: pleiocorm
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  • Storage organ: pleiocorm
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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: present
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  • Bud bank

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

Trophic mode

  • Parasitism and mycoheterotrophy: root hemiparasite
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  • Carnivory: non-carnivorous
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  • Symbiotic nitrogen fixation: no nitrogen-fixing symbionts
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Karyology

  • Chromosome number (2n): 14 (16)
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  • Ploidy level (x): 2
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  • 2C genome size [Mbp]: 464.26
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  • 1Cx monoploid genome size [Mbp]: 232.13
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  • Genomic GC content: 43.9 %
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Taxon origin

  • Origin in the Czech Republic: native
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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
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  • Temperature indicator value: 5 – moderate heat indicator, occurring from lowland to montane belt, mainly in submontane-temperate areas
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  • Moisture indicator value: 4 – transition between values 3 and 5
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  • Reaction indicator value: 4 – transition between values 3 and 5
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  • Nutrient indicator value: 2 – transition between values 1 and 3
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  • Salinity indicator value: 0 – not salt tolerant, glycophyte
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Habitat and sociology

  • Occurrence in habitats

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  • 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: 2 – optimum
  • 7 Acidophilous grasslands

  • 7B Submontane Nardus grasslands: 2 – optimum
  • 11 Heathlands and scrub

  • 11A Dry lowland to subalpine heathlands: 1 – rare occurrence
  • 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
  • Colonization ability

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  • Index of colonization success (ICS): 1

Distribution and frequency

  • Floristic zone: southern temperate, submeridional
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  • Floristic region: Europe
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  • Continentality degree: 4
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  • Distribution range extension along the continentality gradient: 2
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  • Elevational belt in the Czech Republic: colline belt, submontane belt, montane belt
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  • Occurrence frequency in the basic grid mapping cells and quadrants of the basic grid mapping cells: 66, 107
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  • Commonness in vegetation plots from the Czech Republic

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  • Occurrence frequency in vegetation plots: 0 %
  • Occurrence frequency in vegetation plots with a cover above 5%: 0 %
  • Occurrence frequency in vegetation plots with a cover above 25%: 0 %
  • Occurrence frequency in vegetation plots with a cover above 50%: 0 %
  • Mean percentage cover in vegetation plots: 2.8 %
  • Maximum percentage cover in vegetation plots: 3 %
  • Number of habitats with taxon occurrence in the Czech Republic

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  • Number of narrow habitats in which the taxon occurs: 4
  • Number of narrow habitats in which the taxon has its optimum: 2
  • Number of broad habitats in which the taxon occurs: 4
  • Number of broad habitats in which the taxon has its optimum: 2

Threats and protection

  • Red List 2017 (national categories): C2t – endangered taxon, declining
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  • Red List 2017 (IUCN categories): NT – near threatened
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  • Legal protection: not protected by law
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