Pleuropogon refractus (A. Gray) Benth. ex Vasey
nodding semaphoregrass
Poaceae (Grass family)

Introduction to Vascular Plants


© Jamie Fenneman     (Photo ID #9442)


E-Flora BC Static Map

Distribution of Pleuropogon refractus
Click here to view the full interactive map and legend

Species Information

Perennial grass in small clusters from rhizomes; stems hollow, erect, 100-150 cm tall.
Sheaths closed at the base but open for the upper 2-7 cm; blades flat, 3-7 mm wide, sometimes the uppermost reduced to barely 1 cm long; ligules minutely fringed with fine hairs, 1.5-3.5 mm long.
Inflorescence a one-sided raceme, 10-25 cm long; spikelets 5 to 12, broadly spaced, becoming reflexed, loosely 7- to 11-flowered, up to 3 (3.5) cm long; glumes translucent, the lower ones about 4-5 mm long, the upper ones usually somewhat jagged-lobed, 6-7 (8) mm long; lemmas slightly rough, mostly 7-8 mm long, jagged to tri-lobed at the tips, prominently 7-nerved, awned, the awns 3-10 mm long; paleas slightly to considerably shorter than the lemmas, the wings of each keel prominent and free at the tips for 0.5-1 mm, unawned; anthers 3-4 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.


Ecological Framework for Pleuropogon refractus

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)
58 10 135
Slope Gradient (%)
1 0 5

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

197 84 310
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
5 5 6
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

Bogs, streambanks, lakeshores, wet meadows, floodplains, thickets and forest openings in the lowland and montane zones; infrequent on S Vancouver Island and the adjacent lower mainland; S to CA.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Lophochlaena refracta A. Gray
Lophochlaena refracta var. refracta