Data sources

Each value Trefle shows for Ilex opaca, 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 Source not recorded15 Not on the record8 Sources: TRY Plant Trait Database

Field	Shown	What the sources say
Core
Author	Soland. ex Ait.	No source recorded	Source not recorded
Bibliography	Hort. kew. 1:169. 1789	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	1789	No source recorded	Source not recorded
Descriptive
Common name	American holly	No source recorded	Source not recorded
Observations	C. & E. U.S.A.	No source recorded	Source not recorded
Morphology
Average height	530 cm	530 cm · TRY Plant Trait Database · Measured · 75 observations · 2026-10-09 TRY 7.0 datasets 28, 54, 68, 92, 184, 873	Sourced
Flower color	empty	yellow · 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	empty	green · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 92	Not on the record
Foliage texture	coarse	coarse · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 92	Sourced
Fruit color	empty	red · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 92	Not on the record
Fruit conspicuous	true	No source recorded	Source not recorded
Growth form	Single Stem	No source recorded	Source not recorded
Growth habit	Tree, Shrub	No source recorded	Source not recorded
Growth rate	Slow	Slow · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 92	Sourced
Vegetable	false	No source recorded	Source not recorded
Phenology
Duration	perennial	perennial · TRY Plant Trait Database · Measured · 25 observations · 2026-10-09 TRY 7.0 datasets 28, 92, 424	Sourced
Ecology
Nitrogen fixation	None	None · TRY Plant Trait Database · Measured · 8 observations · 2026-10-09 TRY 7.0 datasets 20, 57, 444, 445, 822	Sourced
Ph maximum	pH 7	No source recorded	Source not recorded
Ph minimum	pH 4.5	No source recorded	Source not recorded
Cultivation
Minimum root depth	empty	76 cm · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 92	Not on the record
Usda legacy
C n ratio	empty	21.9 · TRY Plant Trait Database · Measured · 21 observations · 2026-10-09 TRY 7.0 datasets 424	Not on the record
Other
Human usage type	—	berries_nuts_seeds, christmas_trees, fuelwood, nursery_stock, ornamental, timber · TRY Plant Trait Database · Reported · 1 observation · 2026-10-09 TRY 7.0 datasets 68, 92	Not on the record
Salt tolerance	—	Low · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 92	Not on the record
Shade tolerance	—	Deep · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09 TRY 7.0 datasets 92	Not on the record

Ilex opaca Soland. ex Ait., 1789 31% complete

American holly

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Data sources