Brassica juncea (L.) Czern.
Chinese mustard (brown mustard; Chinese mustard; Chinese mustard; leaf mustard)
Brassicaceae (Mustard family)

Introduction to Vascular Plants


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E-Flora BC Static Map

Distribution of Brassica juncea
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Species Information

Annual herb from a taproot; stems glabrous or somewhat glaucous, 0.1-1.0 m tall, branched.
Basal leaves stalked, pinnately cleft with the terminal lobe the largest, 2-3 pairs of lateral lobes or occasionally none, toothed, up to 25 cm long, early deciduous; reduced upward and eventually unstalked, not ear-like at the bases.
In terminal clusters, up to 40 cm long; flower stalks 10-15 mm long, spreading-ascending; petals pale yellow, 8-12 mm long; sepals 4-6 mm long.
Siliques, spreading-ascending, 2-4 cm long, 2-3 mm wide, the midnerve less prominent than the seams of dehiscence; beak 5-10 mm long, slender; seeds about 2 mm long, finely net-veined and honeycombed.

SourceThe Illustrated Flora of British Columbia


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USDA Species Characteristics

Flower Colour:
Blooming Period:
Early Spring
Fruit/Seed characteristics:
Colour: Black
Present over the Summer
Source:  The USDA

Habitat and Range

Mesic fields and waste places in the lowland and montane zones; rare in SW and NE BC, known only from S Vancouver Island, Vancouver and the Dawson Creek area; introduced from Asia.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Brassica integrifolia (Vahl) Schulz, non Rupr.
Brassica japonica Thunb.
Brassica juncea var. crispifolia Bailey
Brassica juncea var. japonica (Thunb.) Bailey
Brassica willdenowii Boiss.
Sinapis juncea