Ambrosia trifida L., 1753 39% complete

Horseweed

Sp. Pl.: 987 (1753)

Data sources

Each value Trefle shows for Ambrosia trifida, 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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Sourced10 Differs from sources4 Source not recorded10 Not on the record7 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.: 987 (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 Horseweed No source recorded
Source not recorded
Family common name Aster family No source recorded
Source not recorded
Observations N. America No source recorded
Source not recorded
Morphology
Average height 120 cm
  • 120 cm · TRY Plant Trait Database · Measured · 15 observations · 2026-10-09
    TRY 7.0 datasets 25, 28, 116, 500, 866, 918, 925
Sourced
Biological type therophyte Sourced
Flower color green Sourced
Foliage texture empty Not on the record
Fruit shape empty Not on the record
Growth habit Subshrub, Forb/herb
  • Subshrub, Forb/herb · Earlier Trefle data · Reported · 2026-10-19
    value present before provenance tracking (2022 import), no source recorded
Sourced
Maximum height 157 cm
  • 156.5 cm · TRY Plant Trait Database · Measured · 2 observations · 2026-10-09
    TRY 7.0 datasets 25, 28, 116, 500, 866, 918, 925
Differs from sources
Sexuality empty Not on the record
Vegetable false No source recorded
Source not recorded
Phenology
Bloom months aug Sourced
Duration annual
  • annual · TRY Plant Trait Database · Measured · 96 observations · 2026-10-09
    TRY 7.0 datasets 4, 28, 110, 759, 918, 925
Sourced
Ecology
Atmospheric humidity 4 / 9 · moderately dry air
  • 4 / 9 · moderately dry air · Earlier Trefle data · Reported · 2026-10-19
    value present before provenance tracking (2022 import), no source recorded
Sourced
Ground humidity empty
  • 5 / 12 · fresh, never flooded (mesohydric) · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09
    TRY 7.0 datasets 489
Not on the record
Light 9 / 9 · full sun Differs from sources
Nitrogen fixation None Sourced
Ph maximum pH 8
  • pH 8 · 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 7.5
  • pH 7.5 · 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 6 / 9 · rather rich (meso-eutrophic) Differs from sources
Soil salinity 0 / 9 · absent from saline soils
  • 1 / 9 · barely saline (hyperoligohaline) · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09
    TRY 7.0 datasets 489
Differs from sources
Usda legacy
C n ratio empty Not on the record
Other
Soil ph indicator — Not on the record
Temperature indicator — Not on the record