Data sources

Each value Trefle shows for Carduus tenuiflorus, 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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Sourced9 Differs from sources5 Source not recorded10 Not on the record6 Sources: TRY Plant Trait Database, Earlier Trefle data

Field	Shown	What the sources say
Core
Author	Curtis	No source recorded	Source not recorded
Bibliography	Fl. Londin. 6: t. 55	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	2004	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, NW. Africa, Europe	No source recorded	Source not recorded
Morphology
Average height	72 cm	72.25 cm · TRY Plant Trait Database · Measured · 10 observations · 2026-10-09 TRY 7.0 datasets 116, 164, 174, 175, 178, 251, 289, 474, 581, 655, 882	Differs from sources
Biological type	therophyte	therophyte · TRY Plant Trait Database · Measured · 6 observations · 2026-10-09 TRY 7.0 datasets 164, 174, 175, 178, 655, 833	Sourced
Flower color	purple	purple · TRY Plant Trait Database · Measured · 2 observations · 2026-10-09 TRY 7.0 datasets 655, 882	Sourced
Fruit color	empty	brown · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 882	Not on the record
Fruit shape	achene	achene · TRY Plant Trait Database · Measured · 4 observations · 2026-10-09 TRY 7.0 datasets 882	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	88 cm	87.5 cm · TRY Plant Trait Database · Measured · 6 observations · 2026-10-09 TRY 7.0 datasets 116, 164, 174, 175, 178, 251, 289, 474, 581, 655, 882	Differs from sources
Vegetable	false	No source recorded	Source not recorded
Phenology
Bloom months	may, jun	mar, jun · TRY Plant Trait Database · Measured · 2 observations · 2026-10-20 TRY 7.0 datasets 174, 833 1 earlier or rejected value Superseded feb, mar · TRY Plant Trait Database · Measured · 2 observations · 2026-10-09 TRY 7.0 datasets 174, 833	Differs from sources
Duration	annual, biennial	annual, biennial · TRY Plant Trait Database · Measured · 13 observations · 2026-10-09 TRY 7.0 datasets 25, 164, 178, 289, 882	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
Ground humidity	empty	4 / 12 · moderately dry (meso-xerophilous) · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 178	Not on the record
Light	9 / 9 · full sun	8 / 9 · light · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 178	Differs from sources
Nitrogen fixation	empty	None · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 71	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)	4 / 9 · rather poor (meso-oligotrophic) · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 178	Differs from sources
Soil salinity	0 / 9 · absent from saline soils	0 / 9 · absent from saline soils · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 178	Sourced
Cultivation
Minimum root depth	empty	16 cm · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 474	Not on the record
Other
Shade tolerance	—	None · TRY Plant Trait Database · Measured · 4 observations · 2026-10-09 TRY 7.0 datasets 174	Not on the record
Soil ph indicator	—	7 · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 178	Not on the record

Carduus tenuiflorus Curtis, 2004 39% complete

Slender thistle

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Data sources