No openly-licensed photo yetWe add Creative-Commons photos from iNaturalist as they’re published.
Poaceae family
St. Eustatius Threeawn Aristida suringarii
St. Eustatius Threeawn is an introduced annual grass, found in Puerto Rico and the U.S. Virgin Islands.
Growing & care
USDA PLANTS · TRY Size & form
Sources · Size & form
USDA PLANTS — Lifespan
TRY Plant Trait Database (CC BY 4.0) — Foliage
- Lifespan
- Annual
- Foliage
- Broadleaf
In the garden
Herb layer — Sits in the herb of a layered food forest or polyculture.Open guide →
derived roles
Species characteristics from USDA PLANTS (public domain) + TRY (CC BY) — general guidance, not a
guarantee for your exact site. Deer "browsing" is documented palatability, not a deer-proof claim.
Wildlife & pollinators
How pollinator value is scored →❧ Caterpillar hosts ~1 caterpillar species
Aristida supports ~1 caterpillar species.
Native butterfly & moth caterpillars are the base of the terrestrial food web — most songbirds rear their young almost entirely on them. As a host for native Lepidoptera this is a modest genus.
Recorded feeding on Aristida in North America, including:
Keystone count (genus-level) from Warren II 2026 (CC0) · Tallamy host-use records. Named species (a documented Nearctic sample, not exhaustive) from NHM HOSTS (CC0).
Species thumbnails re-hosted from iNaturalist — Creative Commons, credited per image (hover for credit). Click any species to see it on iNaturalist. Not exhaustive; many taxa have no openly-licensed photo yet.
Related plants
More Aristida →
Native
Arizona Threeawn
Aristida arizonica
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Native
Arrowfeather Threeawn
Aristida purpurascens
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Native
Beyrich Threeawn
Aristida beyrichiana
●○○○○ 
Native
Bottlebrush Threeawn
Aristida spiciformis
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Native
California Threeawn
Aristida californica
●○○○○ 
Native
Chase's Threeawn
Aristida chaseae
●○○○○ Same genus / family, ranked by ecological value — from the PlantKey catalog
Sources for this entry (9) Open & cited
[01] Scientific name & family — USDA PLANTS (DwCA, Zenodo 17903503)
[02] Growth habit & duration — USDA PLANTS (DwCA, Zenodo 17903503)
[03] Native status & distribution — USDA PLANTS (DwCA, Zenodo 17903503)
[04] Common name — USDA PLANTS (via GBIF)
[05] Invasive / introduced status — USDA PLANTS (DwCA, Zenodo 17903503) — native status
[06] Ecological value — Warren II 2026 (CC0) · Tallamy host-use counts
[07] Foliage — TRY Plant Trait Database (CC BY 4.0)
[08] Caterpillar host count — Warren II 2026 (Dryad, CC0) · Tallamy host-use counts
[09] Caterpillar species — NHM HOSTS (CC0)
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Cite this page Open data, please attribute
PlantKey’s data is open under CC BY-SA 4.0 — free to reuse and adapt, with attribution and the same licence. Photos keep their own per-image licence + credit (see Sources above).
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