Bromus diandrus subsp. rigidus Roth (Roth) Lainz
rip-gut brome
Poaceae (Grass family)

Introduction to Vascular Plants


© Jamie Fenneman     (Photo ID #6860)


E-Flora BC Static Map

Distribution of Bromus diandrus subsp. rigidus
Click here to view the full interactive map and legend

Species Information

Annual grass from fibrous roots; stems usually smooth or hairy only above, 40-80 (100) cm tall.
Sheaths usually spreading soft-hairy or the hairs angled downwards; blades 3-10 (12) mm wide, flat, soft-hairy on both surfaces; ear-shaped lobes lacking at the leaf-bases; ligules somewhat jagged, (2) 3-5 (6) mm long.
Inflorescence a panicle, 10-15 cm long, the branches elongate, nearly erect to spreading, bearing mostly 1 or 2 spikelets; spikelets 5- to 7- (8-) flowered, widest above the midlength, 2.5-4 cm long; florets closed, self-fertilizing; glumes narrowly lanceolate, smooth, the lower ones 1- (rarely 3-) nerved, 13-20 (22) mm long, the upper ones 3-nerved, 25-33 mm long; lemmas rough to short-hairy, 22-30 mm long, long-pointed, bidentate, the teeth slender, 3-4 mm long, awned, the awns straight, 35-60 mm long; anthers (2) 3, mostly included, 1-1.5 mm long, but sometimes exserted and 3-3.5 mm long.

SourceThe Illustrated Flora of British Columbia


Ecological Framework for Bromus diandrus ssp. rigidus

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)
91 31 122
Slope Gradient (%)
26 0 84

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

127 45 225
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 1 2
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

Dry roadsides and waste places in the lowland zone; infrequent on S Vancouver Island and the Gulf Islands, rare in the Vancouver area; introduced from Europe.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Bromus rigidus