Saxifraga tridactylites

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Habitus and growth type

  • Height [m]: 0.03–0.15
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  • Growth form: annual herb
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  • Life form: therophyte
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  • Life strategy: SR – 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): 3 %
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  • Life strategy (Pierce method, S-score): 0 %
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  • Life strategy (Pierce method, R-score): 97 %
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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 – palmately divided
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  • Stipules: absent
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  • Petiole: both present and absent
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  • Leaf life span: overwintering green
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  • Leaf anatomy: mesomorphic
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Flower

  • Flowering period [month]: April–May
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  • Flowering phase: 3 Prunus avium-Ranunculus auricomus (end of early spring)
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  • Flower colour: white, yellow-white
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  • Flower symmetry: actinomorphic
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  • Perianth type: calyx and corolla
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  • Perianth fusion: free
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  • Calyx fusion: synsepalous
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  • Inflorescence type: racemus, anthella
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  • Dicliny: trimonoecious
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  • Generative reproduction type: facultative autogamy
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  • Pollination syndrome: insect-pollination, selfing
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Fruit, seed and dispersal

  • Fruit type: dry fruit – capsule
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  • Fruit colour: brown
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  • Reproduction type: only by seed/spores
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  • Dispersal unit (diaspore): seed
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  • Dispersal strategy: Allium (mainly autochory)
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  • Myrmecochory: non-myrmecochorous (b)
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Belowground organs and clonality

  • Shoot life span (cyclicity): monocyclic shoots prevailing
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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): 5
  • Number of buds per shoot at a depth of 0–10 cm (root buds excluded): 0
  • 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): 5
  • Depth of the belowground bud bank (root buds exluded) [cm]: 1
  • 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): 0
  • 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): 5
  • Depth of the belowground bud bank (root buds included) [cm]: 1

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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Karyology

  • Chromosome number (2n): 22
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  • Ploidy level (x): 2
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  • 2C genome size [Mbp]: 1121.42
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  • 1Cx monoploid genome size [Mbp]: 560.71
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  • Genomic GC content: 39.7 %
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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: 9 – full light plant, occurring only in fully irradiated places, not at less than 50% of diffuse radiation incident in an open area
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  • Temperature indicator value: 6 – transition between values 5 and 7
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  • Moisture indicator value: 2 – transition between values 1 and 3
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  • Reaction indicator value: 7 – indicator of slightly acidic to slightly basic conditions, never occurring in very acidic conditions
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  • Nutrient indicator value: 3 – occurring at nutrient-poor sites more frequently than at average sites and exceptionally at rich sites
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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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  • 1 Vegetation of cliffs, screes and walls

  • 1A Calcareous cliffs: 1 – rare occurrence
  • 8 Dry grasslands

  • 8A Hercynian dry grasslands on rock outcrops: 1 – rare occurrence
  • 8B Submediterranean dry grasslands on rock outcrops: 2 – optimum
  • 8C Narrow-leaved sub-continental steppes: 1 – rare occurrence
  • 9 Sand grasslands and rock-outcrop vegetation

  • 9E Acidophilous vegetation of spring therophytes and succulents: 1 – rare occurrence
  • 9F Basiphilous vegetation of spring therophytes and succulents: 2 – optimum
  • 13 Anthropogenic vegetation

  • 13A Annual vegetation of ruderal habitats: 2 – optimum
  • 13C Annual vegetation of trampled habitats: 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
  • Diagnostic taxon

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  • Diagnostic taxon of alliances: TFF Alysso alyssoidis-Sedion
  • Diagnostic taxon of associations: TFF01 Cerastietum
  • Ecological specialization indices

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  • Ecological specialization index for all vegetation types: 4.9
  • Ecological specialization index for non-forest vegetation: 5.1
  • Colonization ability

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  • Index of colonization success (ICS): 2
  • Index of colonization potential (ICP): 6
  • Optimum successional age [years]: 30

Distribution and frequency

  • Floristic zone: northern temperate, southern temperate, submeridional, meridional
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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: 4
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  • Elevational belt in the Czech Republic: lowlands, colline belt
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  • Expansive taxon in the region: Bohemian Thermophyticum, Bohemian Moravian Mesophyticum, Pannonian Thermophyticum, Carpathian Mesophyticum
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  • Occurrence frequency in the basic grid mapping cells and quadrants of the basic grid mapping cells: 266, 430
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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: 2.1 %
  • 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: 8
  • Number of narrow habitats in which the taxon has its optimum: 3
  • Number of broad habitats in which the taxon occurs: 4
  • Number of broad habitats in which the taxon has its optimum: 3

Threats and protection

  • Red List 2017 (national categories): C3 – vulnerable taxon
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  • Red List 2017 (IUCN categories): NT – near threatened
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  • Legal protection: endangered taxon
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