Data sources

Each value Trefle shows for Verbena simplex, 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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Sourced2 Source not recorded9 Not on the record2 Sources: TRY Plant Trait Database, Earlier Trefle data

Field	Shown	What the sources say
Core
Author	Lehm.	No source recorded	Source not recorded
Bibliography	Index Seminum (HBG, Hamburgensis) 1825: 17 (1825)	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	1825	No source recorded	Source not recorded
Descriptive
Common name	Narrow-leaf vervain	No source recorded	Source not recorded
Observations	E. Canada to NC. & E. U.S.A., NW. Mexico	No source recorded	Source not recorded
Morphology
Average height	empty	22.13 cm · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 415	Not on the record
Growth habit	Forb/herb	Forb/herb · Earlier Trefle data · Reported · 2026-10-19 value present before provenance tracking (2022 import), no source recorded	Sourced
Vegetable	false	No source recorded	Source not recorded
Phenology
Bloom months	may, jun	may, jun · TRY Plant Trait Database · Measured · 53 observations · 2026-10-09 TRY 7.0 datasets 163, 415	Sourced
Duration	empty	perennial · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 28	Not on the record

Verbena simplex Lehm., 1825 12% complete

Narrow-leaf vervain

.fa-secondary{opacity:.4} Data sources

Data sources