Carduus pycnocephalus L., 1763 39% complete

Slender thistle

Sp. Pl. ed. 2 2: 1151 (1763)

Data sources

Each value Trefle shows for Carduus pycnocephalus, with what every source says about it. When sources disagree, the strongest source is shown (how sources are ranked). Values imported before sources were recorded one by one are marked Source not recorded.

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Sourced12 Differs from sources2 Source not recorded10 Not on the record3 Sources: TRY Plant Trait Database, Earlier Trefle data
Field Shown What the sources say
Core
Author L. No source recorded
Source not recorded
Bibliography Sp. Pl. ed. 2 2: 1151 (1763) No source recorded
Source not recorded
Phylum Tracheophyta No source recorded
Source not recorded
Rank species No source recorded
Source not recorded
Status accepted No source recorded
Source not recorded
Year 1763 No source recorded
Source not recorded
Descriptive
Common name Slender thistle No source recorded
Source not recorded
Family common name Aster family No source recorded
Source not recorded
Observations Macaronesia, Europe to W. Pakistan and Arabian Pen., N. Africa No source recorded
Source not recorded
Morphology
Average height 30 cm
  • 30 cm · TRY Plant Trait Database · Measured · 33 observations · 2026-10-09
    TRY 7.0 datasets 164, 175, 249, 251, 581, 655, 882, 918
Sourced
Biological type therophyte
  • therophyte · TRY Plant Trait Database · Measured · 5 observations · 2026-10-09
    TRY 7.0 datasets 164, 175, 655, 918
Sourced
Flower color purple Differs from sources
Fruit color empty Not on the record
Fruit shape achene Sourced
Growth habit Forb/herb
  • Forb/herb · Earlier Trefle data · Reported · 2026-10-19
    value present before provenance tracking (2022 import), no source recorded
Sourced
Maximum height 100 cm
  • 100 cm · TRY Plant Trait Database · Measured · 5 observations · 2026-10-09
    TRY 7.0 datasets 164, 175, 249, 251, 581, 655, 882, 918
Sourced
Vegetable false No source recorded
Source not recorded
Phenology
Bloom months may, jun
  • may|jun · Earlier Trefle data · Reported · 2026-10-19
    value present before provenance tracking (2022 import), no source recorded
Differs from sources
Duration annual, biennial
  • annual, biennial · TRY Plant Trait Database · Measured · 13 observations · 2026-10-09
    TRY 7.0 datasets 164, 882, 918
Sourced
Ecology
Atmospheric humidity 3 / 9 · rather dry air
  • 3 / 9 · rather dry air · Earlier Trefle data · Reported · 2026-10-19
    value present before provenance tracking (2022 import), no source recorded
Sourced
Light 8 / 9 · light
  • 8 / 9 · light · Earlier Trefle data · Reported · 2026-10-19
    value present before provenance tracking (2022 import), no source recorded
Sourced
Nitrogen fixation empty Not on the record
Ph maximum pH 7
  • pH 7 · Earlier Trefle data · Inferred · 2026-10-19
    value present before provenance tracking (2022 import), no source recorded derived from a Baseflor soil reaction class by the 2022 import, a class not a measurement
Sourced
Ph minimum pH 6.5
  • pH 6.5 · Earlier Trefle data · Inferred · 2026-10-19
    value present before provenance tracking (2022 import), no source recorded derived from a Baseflor soil reaction class by the 2022 import, a class not a measurement
Sourced
Soil nutriments 7 / 9 · rich (eutrophic)
  • 7 / 9 · rich (eutrophic) · Earlier Trefle data · Reported · 2026-10-19
    value present before provenance tracking (2022 import), no source recorded
Sourced
Soil salinity 0 / 9 · absent from saline soils
  • 0 / 9 · absent from saline soils · Earlier Trefle data · Reported · 2026-10-19
    value present before provenance tracking (2022 import), no source recorded
Sourced
Usda legacy
C n ratio empty Not on the record