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

Bromus pacificus Shear
Pacific brome
Poaceae (Grass family)

Introduction to Vascular Plants

© Hans Roemer  Email the photographer   (Photo ID #22953)

E-Flora BC Static Map
Distribution of Bromus pacificus
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Species Information

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Perennial grass from fibrous roots, but sometimes rooting at the lower nodes; stems smooth to hairy at the nodes, 60-150 (200) cm tall.
Sheaths usually open for 1-2 cm, strongly soft-hairy to smooth with long fine hairs at the throats; blades (4) 6-10 (15) mm wide, flat, commonly sparsely soft-hairy at least on the upper surfaces, but sometimes smooth; ear-shaped lobes lacking at the leaf-bases; ligules strongly hairy, jagged, brown, 2-5 mm long.
Inflorescence an open, nodding panicle, 15-30 cm long, the branches elongate, spreading to drooping, usually bearing spikelets only towards the tips; spikelets loosely (5-) 7- to 11-flowered, somewhat compressed, 20-30 (35) mm long; florets small, closed, self-fertilizing; glumes lanceolate, usually short-hairy, long-pointed, the lower ones 1 (3)-nerved, 6-9 mm long, the upper ones 3- (5- to 7-) nerved, 9-10 mm long; lemmas rough to short-hairy evenly over the entire surface, rounded to slightly keeled on the backs, 11-14 mm long, the tips long-pointed, shallowly bidentate, awned, the awns 4-10 mm long; anthers exserted, 1-3 (4) mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to mesic coastal meadows, beaches, thickets and open forests in the lowland zone; infrequent in coastal BC; N to SW AK and S to OR.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Bromus pacificus

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) 0 71 248
Slope Gradient (%) 0 15 80
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
35 135 270
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 4 6
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: CDF(2), CWH(13)


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 cool mesothermal.

Synonyms and Alternate Names

Bromopsis pacifica (Shear) Holub

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References