Bromus briziformis Fisch. & C.A. Mey.
rattlesnake grass (rattlesnake brome; rattlesnake chess)
Poaceae (Grass family)

Introduction to Vascular Plants


© Curtis Bjork     (Photo ID #21964)


E-Flora BC Static Map

Distribution of Bromus briziformis
Click here to view the full interactive map and legend

Species Information

Annual grass from fibrous roots; stems densely hairy at the bases, 20-60 cm tall.
Sheaths usually open for 1-2 cm, densely soft-hairy; blades 2-5 mm wide, flat or slightly in-rolled, soft-hairy to short-hairy; ear-shaped lobes lacking at the leaf-bases; ligules hairy, eroded, 0.5-1.5 mm long.
Inflorescence a panicle, 4-12 cm long, with the branches and flowers more or less all to one side of the axis, the branches slender, lax, usually curved to reflexed, mostly bearing solitary spikelets; spikelets 9- to 15-flowered, compressed, cylindrical to egg-shaped, smooth, 15-30 mm long, 8-12 mm wide; florets mostly small, closed, self-fertilized; glumes lanceolate, the lower ones 3- to 5-nerved, 4-6 mm long, the upper ones (5-) 7- to 9-nerved, 7-9 mm long; lemmas inflated, 9-11 mm long, 2.8-4 mm wide, rounded at the tips, unawned, or with awn tips scarcely over 1 mm long; paleas 1-3 mm shorter than the lemmas; anthers, rarely exserted, about 0.8 mm long.

SourceThe Illustrated Flora of British Columbia


If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

USDA Species Characteristics

Flower Colour:
Blooming Period:
Late Spring
Fruit/Seed characteristics:
Colour: Brown
Present from Spring to Summer
Source:  The USDA


Ecological Framework for Bromus briziformis

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres)
709 502 1000
Slope Gradient (%)
31 5 46

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

199 98 256
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 1 4
Modal Nutrient Regime
# of field plots
 species was recorded in:
Modal BEC Zone Class

All BEC Zones (# of stations/zone) species was recorded in

ICH(1), IDF(2), PP(4)

Habitat and Range

Dry meadows, roadsides and waste places; rare in SE BC; introduced from Eurasia.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Bromus brizaeformis Fischer & C. Meyer [orthographic variant]