Whiskered Brome Bromus grossus
Whiskered Brome is an introduced annual grass, found in the lower 48 states. It grows to 1.0 ft.
More about this plant
Bromus grossus, the whiskered brome, is a species of flowering plant in the family Poaceae. It is native to central Europe, and has been introduced to Great Britain, New York and Oregon in the United States. It has gone extinct in the Netherlands. During the Neolithic it arose as a weed of spelt fields, and due to changing agricultural practices, it is now considered highly endangered under the Habitats Directive. Wikipedia →
Growing & care
USDA PLANTS · TRY- Hardiness
- ≥ zone 7 derived from its U.S. range
- Height
- 1.0 ft
- Lifespan
- Annual
- Foliage
- Broadleaf
Wildlife & pollinators
How pollinator value is scored →❧ Caterpillar hosts ~12 caterpillar species
Bromus supports ~12 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 moderate genus.
Recorded feeding on Bromus in North America, including:
+ 8 more species → ↑ show fewer
Wildlife & visitors 1 bird · 1 mammal
Open records of who else uses Whiskered Brome — a generalist food-web signal, kept separate from the keystone Ecological Value.
Recorded eaten by 1 bird and 1 mammal species (fruit, seed, browse):
Related plants
More Bromus →
How we know this (3) Methods & honest limits
We read each species’ measured specific leaf area (leaf area per unit dry weight) from the Global Spectrum dataset and band it: thin & fast (high SLA), medium, or thick & tough (low SLA). The global median is about 10 mm²/mg.
Honest limits: A species-mean from pooled measurements — individual plants vary with light and site. A broad strategy signal, not a precise per-plant figure.
We place each species on Grime’s competitor–stress-tolerator–ruderal (C–S–R) triangle using the globally-calibrated “StrateFy” method: leaf size drives the competitor score, dense low-area leaves the stress-tolerator score, and thin high-area leaves the ruderal score. The result is a C/S/R percentage mix and one of 19 strategy classes; we show it in plain words and keep the percentages for the curious.
Honest limits: A species-mean strategy from pooled global leaf measurements — a broad ecological signal, not a precise per-plant or per-site value. Derived, never a measured fact.
A recorded categorical fact: each species is tagged C3 (standard), C4 (heat/water-efficient) or CAM (succulent, night-time CO₂ uptake) — or a facultative combination. We only show a trait card for the noteworthy C4/CAM cases; C3 is the unremarkable majority, kept in the data but not surfaced as a card.
Sources for this entry (17) Open & cited
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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