Achnatherum richardsonii (Link) Barkworth
spreading needlegrass (Richardson's needlegrass)
Poaceae (Grass family)

Introduction to Vascular Plants

Photograph

© Curtis Bjork     (Photo ID #16546)


Map

E-Flora BC Static Map

Distribution of Achnatherum richardsonii
Click here to view the full interactive map and legend

Species Information

General:
Perennial tufted grass from fibrous roots; stems 30-100 cm tall.
Leaves:
Sheaths smooth to slightly hairy; blades 0.8-3 mm wide; lower ligules 0.1-0.5 mm long, higher on the sides than on the back.
Flowers:
Inflorescence a panicle, 8-30 cm long, the branches zig-zag, broadly spreading, the mature spikelets drooping at the ends of the branches; glumes green, unequal, the lower ones 9-15 mm long, the upper 2-3 mm shorter than the lower; lemmas 4.5-5.5 mm long, smooth above, sparsely hairy below, the hairs 0.2-0.5 mm long, awned, the awns 15-25 mm long, twice bent, the first segments rough or short-hairy, the terminal segments zig-zag, persistent; paleas 1/2-3/5 as long as the lemmas, the calluses 0.4-0.7 mm long, blunt.

SourceThe Illustrated Flora of British Columbia

Illustration

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.

Ecology

Ecological Framework for Achnatherum richardsonii

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

Avg

Min

Max

Elevation (metres)
989 357 2030
Slope Gradient (%)
12 0 140

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

199 0 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
3 0 6
Modal Nutrient Regime
Class
C
# of field plots
 species was recorded in:
576
Modal BEC Zone Class
IDF

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

BG(26), BWBS(3), ESSF(10), IDF(374), MS(20), PP(65), SBPS(31), SBS(28)

Habitat and Range

Moist to dry slopes and open forests in the steppe and montane zones; locally frequent in SC, SE and WC BC; N to YT, E to MB and S to SD, CO, ID and WA.

SourceThe Illustrated Flora of British Columbia

Synonyms

Synonyms and Alternate Names:
Stipa richardsonii Link