Scleranthus annuus L., 1753 43% complete

German-knotweed

Sp. Pl.: 406 (1753)

Data sources

Each value Trefle shows for Scleranthus annuus, 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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Sourced16 Differs from sources1 Source not recorded9 Not on the record6 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.: 406 (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 German-knotweed No source recorded
Source not recorded
Observations Macaronesia, Europe to C. Siberia, Medit. to Iran and Arabian Pen. No source recorded
Source not recorded
Morphology
Average height 11 cm
  • 10.5 cm · TRY Plant Trait Database · Measured · 12 observations · 2026-10-09
    TRY 7.0 datasets 25, 45, 174, 178, 203, 251, 270, 918
Differs from sources
Biological type therophyte
  • therophyte · TRY Plant Trait Database · Measured · 15 observations · 2026-10-09
    TRY 7.0 datasets 4, 25, 71, 174, 178, 203, 500, 918
Sourced
Flower color green Sourced
Foliage texture empty Not on the record
Fruit shape nut 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 20 cm
  • 20 cm · TRY Plant Trait Database · Measured · 5 observations · 2026-10-09
    TRY 7.0 datasets 25, 45, 174, 178, 203, 251, 270, 918
Sourced
Vegetable false No source recorded
Source not recorded
Phenology
Bloom months apr, may, jun, jul
  • apr, may, jun, jul · TRY Plant Trait Database · Measured · 4 observations · 2026-10-20
    TRY 7.0 datasets 4, 45, 174, 203
1 earlier or rejected value
  • Superseded feb, apr, may, jul · TRY Plant Trait Database · Measured · 4 observations · 2026-10-09
    TRY 7.0 datasets 4, 45, 174, 203
Sourced
Duration annual, biennial
  • annual, biennial · TRY Plant Trait Database · Measured · 16 observations · 2026-10-09
    TRY 7.0 datasets 4, 25, 28, 71, 178, 203, 460, 818, 882, 918
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 4 / 12 · moderately dry (meso-xerophilous)
  • 4 / 12 · moderately dry (meso-xerophilous) · TRY Plant Trait Database · Measured · 3 observations · 2026-10-09
    TRY 7.0 datasets 178, 203, 242
Sourced
Light 7 / 9 · half-light to light
  • 7 / 9 · half-light to light · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09
    TRY 7.0 datasets 178
Sourced
Nitrogen fixation None Sourced
Ph maximum pH 4.5
  • pH 4.5 · 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
Ph minimum pH 4
  • pH 4 · 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 5 / 9 · intermediate (mesotrophic)
  • 5 / 9 · intermediate (mesotrophic) · TRY Plant Trait Database · Measured · 2 observations · 2026-10-09
    TRY 7.0 datasets 178, 242
Sourced
Soil salinity 0 / 9 · absent from saline soils
  • 0 / 9 · absent from saline soils · TRY Plant Trait Database · Measured · 4 observations · 2026-10-09
    TRY 7.0 datasets 178, 242, 489
Sourced
Cultivation
Minimum root depth 20 cm Sourced
Usda legacy
C n ratio empty Not on the record
Other
Propagation method — Not on the record
Shade tolerance — Not on the record
Soil ph indicator — Not on the record
Temperature indicator — Not on the record