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Montana Field Guide

Montana Field Guides

Black Mustard - Brassica nigra

Non-native Species

Global Rank: GNR
State Rank: SNA

Agency Status
MNPS Threat Rank:
C-value: 1

External Links

General Description
Annual. Stems erect, branched above, 40–100 cm. Basal leaves lyrate-pinnate to lobed with dentate margins, early deciduous. Stem leaves reduced above, becoming ovate. Vestiture hirsute below to glabrous. Petals 6–9 mm long. Fruits: strictly erect; the body 8–15 mm long, strongly 2-nerved and angled; the beak 1–3 cm long, conical; pedicel ca. 2 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Weedy across North America.

Observations in Montana Natural Heritage Program Database
Number of Observations: 10

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)


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Citation for data on this website:
Black Mustard — Brassica nigra.  Montana Field Guide.  .  Retrieved on , from