Data sources

Each value Trefle shows for Lactuca serriola, 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 sources3 Source not recorded14 Not on the record8 Sources: TRY Plant Trait Database

Field	Shown	What the sources say
Core
Author	L.	No source recorded	Source not recorded
Bibliography	Cent. Pl. II: 29 (1756)	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	1756	No source recorded	Source not recorded
Descriptive
Common name	Milk thistle	No source recorded	Source not recorded
Family common name	Aster family	No source recorded	Source not recorded
Observations	Europe to SW. Siberia and Xinjiang, NW. Africa	No source recorded	Source not recorded
Morphology
Average height	74 cm	73.5 cm · TRY Plant Trait Database · Measured · 32 observations · 2026-10-09 TRY 7.0 datasets 25, 28, 116, 164, 174, 175, 178, 203, 251, 299, 474, 500, 520, 574, 655, 818, 853, 882, 897, 902, 918	Differs from sources
Biological type	therophyte	therophyte · TRY Plant Trait Database · Measured · 11 observations · 2026-10-09 TRY 7.0 datasets 4, 25, 71, 164, 174, 175, 178, 350, 500, 655, 882, 918	Sourced
Flower color	yellow	yellow · TRY Plant Trait Database · Measured · 5 observations · 2026-10-09 TRY 7.0 datasets 4, 350, 655, 882	Sourced
Foliage texture	coarse	coarse · TRY Plant Trait Database · Measured · 2 observations · 2026-10-09 TRY 7.0 datasets 4, 71	Sourced
Fruit color	brown, grey	brown, grey · TRY Plant Trait Database · Measured · 3 observations · 2026-10-09 TRY 7.0 datasets 882	Sourced
Fruit shape	achene	achene · TRY Plant Trait Database · Measured · 10 observations · 2026-10-09 TRY 7.0 datasets 4, 350, 882	Sourced
Growth habit	Forb/herb	No source recorded	Source not recorded
Inflorescence type	empty	head · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 350	Not on the record
Maximum height	110 cm	110 cm · TRY Plant Trait Database · Measured · 6 observations · 2026-10-09 TRY 7.0 datasets 25, 28, 116, 164, 174, 175, 178, 203, 251, 299, 474, 500, 520, 574, 655, 818, 853, 882, 897, 902, 918	Sourced
Sexuality	empty	hermaphrodite · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 4	Not on the record
Vegetable	false	No source recorded	Source not recorded
Phenology
Bloom months	feb, jul	feb, jul · TRY Plant Trait Database · Measured · 5 observations · 2026-10-09 TRY 7.0 datasets 4, 163, 174, 203	Sourced
Duration	annual, biennial	annual, biennial · TRY Plant Trait Database · Measured · 30 observations · 2026-10-09 TRY 7.0 datasets 4, 25, 28, 71, 164, 175, 178, 193, 203, 299, 432, 818, 882, 918	Sourced
Fruit months	empty	jan, feb, mar, apr, may, sep, oct, nov, dec · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 882	Not on the record
Ecology
Atmospheric humidity	4 / 9 · moderately dry air	No source recorded	Source not recorded
Ground humidity	5 / 12 · fresh, never flooded (mesohydric)	5 / 12 · fresh, never flooded (mesohydric) · TRY Plant Trait Database · Measured · 2 observations · 2026-10-09 TRY 7.0 datasets 178, 242	Sourced
Light	7 / 9 · half-light to light	8 / 9 · light · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 178	Differs from sources
Nitrogen fixation	None	None · TRY Plant Trait Database · Measured · 4 observations · 2026-10-09 TRY 7.0 datasets 71, 193, 445, 882	Sourced
Ph maximum	pH 7.5	No source recorded	Source not recorded
Ph minimum	pH 7	No source recorded	Source not recorded
Soil nutriments	6 / 9 · rather rich (meso-eutrophic)	5 / 9 · intermediate (mesotrophic) · TRY Plant Trait Database · Measured · 2 observations · 2026-10-09 TRY 7.0 datasets 178, 242	Differs from sources
Soil salinity	0 / 9 · absent from saline soils	0 / 9 · absent from saline soils · TRY Plant Trait Database · Measured · 2 observations · 2026-10-09 TRY 7.0 datasets 178, 242	Sourced
Cultivation
Minimum root depth	84 cm	84 cm · TRY Plant Trait Database · Measured · 7 observations · 2026-10-09 TRY 7.0 datasets 432, 818	Sourced
Usda legacy
C n ratio	empty	15.1 · TRY Plant Trait Database · Measured · 4 observations · 2026-10-09 TRY 7.0 datasets 228, 412	Not on the record
Other
Propagation method	—	seed · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 174	Not on the record
Shade tolerance	—	None · TRY Plant Trait Database · Measured · 5 observations · 2026-10-09 TRY 7.0 datasets 174	Not on the record
Soil ph indicator	—	6 · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 489	Not on the record
Temperature indicator	—	7 · TRY Plant Trait Database · Measured · 2 observations · 2026-10-09 TRY 7.0 datasets 203, 242	Not on the record

Lactuca serriola L., 1756 50% complete

Milk thistle

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Data sources