E-Flora BC: Electronic Atlas of the Flora of British Columbia

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

Introduction to Vascular Plants

© Curtis Bjork  Email the photographer   (Photo ID #21964)

E-Flora BC Static Map
Distribution of Bromus briziformis
Click here to view our interactive map and legend
Details about map content are available here
Click on the map dots to view record details.

Species Information

Click on the image below to view an expanded illustration for this species.

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.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

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

Habitat / Range

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

Source: The Illustrated Flora of British Columbia


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) 502 709 1000
Slope Gradient (%) 5 31 46
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
98 199 256
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 2 4
Modal Nutrient Regime
Number 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)


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Bromus brizaeformis Fischer & C. Meyer [orthographic variant]

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References