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

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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Distribution of Brassica juncea
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Species Information

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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.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

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

Habitat / 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.

Source: The Illustrated Flora of British Columbia


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.

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

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References