Bromus marginatus Nees ex Steud.

vernacular mountain brome — species · Poaceae

USDA: BRMA4
GBIF: 2703686
Rank: species

mountain brome (Bromus marginatus) — Platephotograph · Andrey ZharkikhCC BY-NC source · iNaturalist ↗

§2Habit & range

Growth habit: Graminoid
Duration: Perennial
Group: Monocot
Family: Poaceae Barnhart
Genus: Bromus

§2a

Native status, by region

AK Alaska Introduced
CAN Canada Native
L48 Lower 48 States Native

§2b

County-level range

· 2 counties across 1 state

Legend Native · 2 Introduced · 0 Both · 0 Hover a county for detail.

§3Cultivation specs · USDA

Recorded by the USDA Plant Materials Program.

§3a

Tolerances

Drought: Medium
Shade: High
Moisture use: High
Fire: Low
Salinity: High
Anaerobic: None
CaCO₃: Medium
Hedging: None

§3b

Climate & soil

Cold tolerance: -28 °F minimum
Frost-free days: 150 min.
Precipitation: 10–20 in/yr
pH range: 5.5–8
Root depth: 20 in min.
Fertility need: Low
Soil texture: coarse, medium

§3c

Form & growth

Growth form: Bunch
Growth rate: Rapid
Lifespan: Short
Mature height: 4 ft
Foliage texture: Coarse
Foliage colour: Green
Porosity (summer): Moderate
Porosity (winter): Porous
Flower colour: Yellow
Fruit colour: Brown
Fire resistant: No
N fixation: None
Toxicity: None

§3d

Reproduction

Bloom period: Spring
Seed abundance: High
Seed begins: Spring
Seed ends: Summer
Spread rate: Slow
Stratify: No
Seeds / lb: 64,080
Propagation: seed

§3e

Use & availability

Commercial availability: Routinely Available
Nursery stock: No
Browse palatability: Medium
Graze palatability: High
Palatable, human: No
Protein potential: Medium
Lumber: No
Christmas tree: No

§4Counties, by state

Recorded in 2 counties across 1 state.

Montana view state ↗ 2 N ▾

§5Sources & provenance

USDA PLANTS

Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.

plants.usda.gov/BRMA4 ↗

GBIF Backbone

Canonical taxonomic identity, synonym resolution, cross-refs. CC0.

gbif.org/species/2703686 ↗

Record version

Cached and built locally. Source version on this record:

usda-plants-mt-2026-05-25

fetched 2026-05-25T18:27:19Z