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

Bromus japonicus Thunb.
Japanese brome
Poaceae (Grass family)

Introduction to Vascular Plants

© Bryan Kelly-McArthur  Email the photographer   (Photo ID #89552)

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Distribution of Bromus japonicus
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Species Information

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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

Source: The Illustrated Flora of British Columbia

Habitat / Range

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

Source: The Illustrated Flora of British Columbia


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) 385 686 1480
Slope Gradient (%) 0 33 80
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 175 346
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 2 5
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: BG(3), ICH(1), IDF(49), MS(1), PP(7)


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 not evaluated, unknown or variable.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References