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

Setaria viridis (L.) P. Beauv.
green bristlegrass
Poaceae (Grass family)

Introduction to Vascular Plants

© Chris Sears  Email the photographer   (Photo ID #80858)

E-Flora BC Static Map
Distribution of Setaria viridis
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Species Information

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Annual grass from fibrous roots, basally branching; stems decumbent to erect, 10-100 cm tall.
Sheaths keeled, smooth; blades flat to folded, 4-11 mm wide, smooth or fringed with soft fine hairs at the throats, the collars slightly hairy or smooth; ligules scarcely 2 mm long, fringed with fine hairs.
Inflorescence a rather narrow, cylindrical panicle, not obviously lobed, rarely over 10 cm long, 15 mm wide when pressed; spikelets 2-flowered, 3-3.6 mm long, each subtended by 2 or 3 (4), rough bristles that are up to 3 times as long as the spikelets, the hairs directed upwards; lower flowers staminate or sterile, the upper fertile; fertile lemmas and paleas nearly completely enclosed by the upper glumes and sterile lemmas, and not shed separately from them, usually evidently cross-wrinkled when mature.
Closely related to S. italica.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic to dry fields, roadsides and waste areas in the lowland, steppe and montane zones; frequent in S BC; introduced from Eurasia.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Setaria viridis

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) 968 968 968
Slope Gradient (%) 0 0 0
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 1 1
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)


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.

Taxonomic and Nomenclatural Links

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Related Databases

Species References

Dore, William G. and J. McNeill. 1980. Grasses of Ontario. Agriculture Canada. Monograph 26. Ottawa.

Pohl, Richard W. 1962. Notes on Setaria faberi and S. viridis (Gramineae). Brittonia 14 (2): 210-213 .

General References