Bromus inermis Leyss.
Poaceae (Grass Family)
USDA Symbol: BRIN2
This species includes subspecies that are North American natives. However, it also includes subspecies that are not native to North America, e.g. Bromus inermis ssp. inermis, Smooth Brome. Non-native taxa are not treated in this database.
A rhizomatous, clump-forming, perennial grass bearing many light green (sometimes purple- or bronze-tinged), narrow, usually hairless spikelets in a loose, much-branched terminal cluster.
This drought-resistant Eurasian species was deliberately introduced into the United States around 1880 as a hay and pasture grass and for reseeding western ranges. It has since gone wild throughout the United States and much of Canada (except the far north) and is now one of our most common weedy grasses; in some areas it is considered an undesirable plant because of its aggressiveness. However, its deep roots make it an excellent soil binder, protecting against erosion. Relished by all kinds of livestock, it is a fine forage. The species name means "unarmed," alluding to the spikelets, which do not have the long bristles characteristic of some of Smooth Brome's relatives. A rare variant has hairy spikelets.
From the Image Gallery
Bloom InformationBloom Color: Yellow
Bloom Time: May , Jun , Jul
DistributionUSA: AK , AR , AZ , CA , CO , CT , DC , DE , IA , ID , IL , IN , KS , KY , LA , MA , MD , ME , MI , MN , MO , MS , MT , NC , ND , NE , NH , NJ , NM , NV , NY , OH , OK , OR , PA , RI , SC , SD , TN , TX , UT , VA , VT , WA , WI , WV , WY
Canada: AB , BC , MB , NB , NL , NS , NT , ON , PE , QC , SK , YT
Native Distribution: Throughout most of North America, except parts of far north; least common in southeastern United States.
Native Habitat: Roadsides, fields, pastures, nursery plots, and waste places.
Growing ConditionsWater Use: Medium
Light Requirement: Sun
CaCO3 Tolerance: Low
Butterflies and Moths of North America (BAMONA)
Orange-edged Roadside-Skipper |
Learn more at BAMONA
Adult Food Source
Find Seed or Plants
Find seed sources for this species at the Native Seed Network.
National Wetland Indicator Status
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Native Seed Network - Corvallis, OR
BibliographyBibref 1186 - Field Guide to Moths of Eastern North America (2005) Covell, C.V., Jr.
Bibref 1185 - Field Guide to Western Butterflies (Peterson Field Guides) (1999) Opler, P.A. and A.B. Wright
Search More Titles in Bibliography
Additional resourcesUSDA: Find Bromus inermis in USDA Plants
FNA: Find Bromus inermis in the Flora of North America (if available)
Google: Search Google for Bromus inermis
MetadataRecord Modified: 2022-03-09
Research By: TWC Staff