Bromus japonicus Thunb.
Japanese brome
Poaceae (Grass family)

Introduction to Vascular Plants


© Bryan Kelly-McArthur     (Photo ID #89552)


E-Flora BC Static Map

Distribution of Bromus japonicus
Click here to view the full interactive map and legend

Species Information

Annual grass from fibrous roots; stems 20-50 (70) cm tall.
Sheaths densely hairy, the hairs long and angled downwards (at least the lower ones); blades 1.5-3 (4) mm wide, flat, usually soft-hairy; ear-shaped lobes lacking at the leaf-bases; ligules hairy, jagged with fine hairs, 0.5-1.5 mm long.
Inflorescence an open, diffuse panicle, 7-15 (rarely 20) cm long, the branches slender, spreading to drooping and usually more or less wavy; spikelets 7- to 12-flowered, slightly compressed, smooth or more or less rough, 2-4 cm long, the stalks mostly longer than the spikelets; florets mostly small, closed, self-fertilizing; lower glumes lanceolate, 3-nerved, (3.5) 4-6 mm long, the upper ones lanceolate, 5-nerved, 5.5-8 mm long; lemmas somewhat leathery, broadly lanceolate, nearly circular in cross-section, tapered, rough, faintly 9-nerved, somewhat compressed, rounded on the backs, 8-10 mm long, up to 4 mm wide, the tips blunt and rounded and merely shallowly notched but readily splitting to the awns, the awns inserted 1-2.5 mm below the tips of the lemmas, usually somewhat twisted and abruptly bent at maturity, broadly spreading, flattened at the bases, 8-12 (15) mm long; paleas 1.5-3 (4) mm shorter than the lemmas; anthers included within the lemmas, about 1 mm long. vol7_3

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 Bromus japonicus

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)
686 385 1480
Slope Gradient (%)
33 0 80

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

175 0 346
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 0 5
Modal Nutrient Regime
# of field plots
 species was recorded in:
Modal BEC Zone Class

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

BG(3), ICH(1), IDF(49), MS(1), PP(7)

Habitat and Range

Dry fields and waste places in the steppe zone; infrequent in SC and SE BC; introduced from Eurasia.

SourceThe Illustrated Flora of British Columbia