Data sources

Each value Trefle shows for Pteridium aquilinum, 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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Sourced19 Differs from sources3 Source not recorded9 Not on the record6 Sources: TRY Plant Trait Database, Earlier Trefle data, POWO / WCVP (Kew)

Field	Shown	What the sources say
Core
Author	(L.) Kuhn	(L.) Kuhn · POWO / WCVP (Kew) · Reported · 2026-10-11	Sourced
Bibliography	O. Kersten, Reis. Ost-Afr. 3(3):11. 1879	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	1879	No source recorded	Source not recorded
Descriptive
Common name	Bracken	No source recorded	Source not recorded
Observations	Macaronesia, N. & NE. Trop. Africa, Arabian Pen., Europe to Siberia and Iran	No source recorded	Source not recorded
Morphology
Average height	53 cm	53 cm · TRY Plant Trait Database · Measured · 102 observations · 2026-10-09 TRY 7.0 datasets 25, 86, 92, 116, 158, 161, 164, 174, 178, 203, 236, 249, 335, 500, 654, 729, 918, 925	Sourced
Biological type	geophyte	geophyte · TRY Plant Trait Database · Measured · 142 observations · 2026-10-09 TRY 7.0 datasets 4, 71, 158, 161, 164, 174, 175, 178, 203, 220, 350, 500, 918, 925	Sourced
Flower color	empty	green · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 92	Not on the record
Flower conspicuous	false	No source recorded	Source not recorded
Foliage color	green	green · TRY Plant Trait Database · Measured · 27 observations · 2026-10-09 TRY 7.0 datasets 92, 236, 443, 879	Sourced
Foliage texture	medium	fine · TRY Plant Trait Database · Measured · 13 observations · 2026-10-09 TRY 7.0 datasets 4, 92, 236, 443, 879	Differs from sources
Fruit color	brown	brown · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 92	Sourced
Fruit conspicuous	false	No source recorded	Source not recorded
Growth form	Rhizomatous	Rhizomatous · Earlier Trefle data · Reported · 2026-10-19 value present before provenance tracking (2022 import), no source recorded	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
Growth rate	Moderate	Moderate · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 92	Sourced
Maximum height	150 cm	150 cm · TRY Plant Trait Database · Measured · 3 observations · 2026-10-09 TRY 7.0 datasets 25, 86, 92, 116, 158, 161, 164, 174, 178, 203, 236, 249, 335, 500, 654, 729, 918, 925	Sourced
Sexuality	empty	hermaphrodite · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 4	Not on the record
Vegetable	true	true · Earlier Trefle data · Reported · 2026-10-19 value present before provenance tracking (2022 import), no source recorded	Sourced
Phenology
Bloom months	jul, aug, sep, oct	jul, aug · TRY Plant Trait Database · Measured · 7 observations · 2026-10-20 TRY 7.0 datasets 4, 45, 174, 203 1 earlier or rejected value Superseded feb, jul, aug · TRY Plant Trait Database · Measured · 7 observations · 2026-10-09 TRY 7.0 datasets 4, 45, 174, 203	Differs from sources
Duration	perennial	perennial · TRY Plant Trait Database · Measured · 140 observations · 2026-10-09 TRY 7.0 datasets 4, 86, 92, 164, 175, 178, 203, 236, 432, 443, 818, 879, 882, 918, 925	Sourced
Ecology
Atmospheric humidity	5 / 9 · medium air humidity	5 / 9 · medium air humidity · Earlier Trefle data · Reported · 2026-10-19 value present before provenance tracking (2022 import), no source recorded	Sourced
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, 489	Sourced
Light	6 / 9 · half-shade to half-light	6 / 9 · half-shade to half-light · TRY Plant Trait Database · Measured · 2 observations · 2026-10-09 TRY 7.0 datasets 178, 489	Sourced
Nitrogen fixation	None	None · TRY Plant Trait Database · Measured · 7 observations · 2026-10-09 TRY 7.0 datasets 20, 57, 71, 89, 822	Sourced
Ph maximum	pH 7	pH 7 · Earlier Trefle data · Reported · 2026-10-19 value present before provenance tracking (2022 import), no source recorded	Sourced
Ph minimum	pH 4.5	pH 4.5 · Earlier Trefle data · Reported · 2026-10-19 value present before provenance tracking (2022 import), no source recorded	Sourced
Soil nutriments	5 / 9 · intermediate (mesotrophic)	3 / 9 · poor (oligotrophic) · TRY Plant Trait Database · Measured · 2 observations · 2026-10-09 TRY 7.0 datasets 178, 489	Differs from sources
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	25 cm	25 cm · TRY Plant Trait Database · Measured · 5 observations · 2026-10-09 TRY 7.0 datasets 92, 432, 818	Sourced
Usda legacy
C n ratio	empty	20.2 · TRY Plant Trait Database · Measured · 10 observations · 2026-10-09 TRY 7.0 datasets 228, 412	Not on the record
Other
Salt tolerance	—	None · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 92	Not on the record
Soil ph indicator	—	3 · TRY Plant Trait Database · Measured · 2 observations · 2026-10-09 TRY 7.0 datasets 178, 203, 489	Not on the record
Temperature indicator	—	5 · TRY Plant Trait Database · Measured · 2 observations · 2026-10-09 TRY 7.0 datasets 203, 489	Not on the record

Pteridium aquilinum (L.) Kuhn, 1879 49% complete

Bracken

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Data sources