Data sources

Each value Trefle shows for Lactuca perennis, 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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Sourced5 Differs from sources2 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	Sp. Pl.: 796 (1753)	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	1753	No source recorded	Source not recorded
Descriptive
Common name	Blue lettuce	No source recorded	Source not recorded
Family common name	Aster family	No source recorded	Source not recorded
Observations	Europe	No source recorded	Source not recorded
Morphology
Average height	50 cm	50 cm · TRY Plant Trait Database · Measured · 6 observations · 2026-10-09 TRY 7.0 datasets 25, 164, 251, 310, 500, 544, 729	Sourced
Biological type	hemicryptophyte	hemicryptophyte · TRY Plant Trait Database · Measured · 9 observations · 2026-10-09 TRY 7.0 datasets 4, 25, 71, 164, 175, 500, 544, 918	Sourced
Flower color	blue	blue, purple · TRY Plant Trait Database · Measured · 4 observations · 2026-10-09 TRY 7.0 datasets 4	Differs from sources
Foliage texture	empty	coarse · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 4	Not on the record
Fruit shape	empty	nut · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 4	Not on the record
Maximum height	empty	No source recorded 1 earlier or rejected value Rejected 30 cm · TRY Plant Trait Database · Measured · 3 observations · 2026-10-09 TRY 7.0 datasets 25, 164, 251, 310, 500, 544, 729 below the average height (50 cm) of the same record	Not on the record
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	may, jun, jul	No source recorded	Source not recorded
Duration	perennial	perennial · TRY Plant Trait Database · Measured · 4 observations · 2026-10-09 TRY 7.0 datasets 4, 164, 175, 918	Sourced
Ecology
Atmospheric humidity	3 / 9 · rather dry air	No source recorded	Source not recorded
Ground humidity	empty	2 / 12 · dry (perxerophilous) · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 242	Not on the record
Light	9 / 9 · full sun	9 / 9 · full sun · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 489	Sourced
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 8	No source recorded	Source not recorded
Ph minimum	pH 7.5	No source recorded	Source not recorded
Soil nutriments	5 / 9 · intermediate (mesotrophic)	2 / 9 · very poor (peroligotrophic) · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 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 242, 489	Sourced
Other
Soil ph indicator	—	8 · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 242	Not on the record
Temperature indicator	—	7 · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 242	Not on the record

Lactuca perennis L., 1753 35% complete

Blue lettuce

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Data sources