Page authors: Ben Legler, David Giblin
Brassica nigra
black mustard
WTU specimens
Other herbaria

Distribution: Occurring in scattered locations throughout Washington; widely distributed throughout much of North America.

Habitat: Distrubed areas such as roadsides, fields, and waste lots.

Flowers: May-August

Origin: Introduced from Eurasia

Conservation Status: Not of concern

Description:
General:

Tall annual herb; stems 0.4-1.5 meters tall; usually branching; hairy near base.

Leaves:

Alternate; lower leaves pinnately lobed; upper leaves simple.

Flowers:

In bright yellow clusters (racemes) at stem tips; with 4 petals.

Fruits:

Narrow pods (siliques) to 2.5 cm long.

Identification Notes:

Distinguished from other Brassica spp. mostly by fruit characteristics; see technical keys.

Accepted Name:
Brassica nigra (L.) W.D.J. Koch
Publication: Deutschl. Fl. ed. 3. 4: 713. 1833. 1833.

Synonyms & Misapplications:
Sinapis nigra L.
Additional Resources:

PNW Herbaria: Specimen records of Brassica nigra in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Brassica nigra checklist entry.

E-Flora BC: Brassica nigra atlas page.

CalPhotos: Brassica nigra photos.

USDA Plants: Brassica nigra information.

16 photographs:
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