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

Introduction to Vascular Plants


© Chris Sears     (Photo ID #80858)


E-Flora BC Static Map

Distribution of Setaria viridis
Click here to view the full interactive map and legend

Species Information

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.

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.


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
# of field plots
 species was recorded in:
Modal BEC Zone Class

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


Habitat and Range

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

SourceThe Illustrated Flora of British Columbia


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 .