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Montana Field Guide

Montana Field Guides

Field Mustard - Brassica rapa
Other Names:  Bird's Rape, Brassica campestris

Non-native Species

Global Rank: GNR
State Rank: SNA

Agency Status
MNPS Threat Rank:
C-value: 1

External Links

General Description
Mostly glabrous and glaucous annual. Stems erect, branched above, 30–100 cm. Basal leaves lyrate-pinnate with 2–6 lateral lobes and sinuate margins, early deciduous. Stem leaves lanceolate with entire margins, 3–10 cm long, becoming sessile, auriculate clasping. Petals 7–13 mm long. Fruits: the body 3–6 cm long, strongly 2-nerved; the beak 10–15 mm long, conical (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
The species is weedy throughout North America.

Observations in Montana Natural Heritage Program Database
Number of Observations: 5

(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:
Field Mustard — Brassica rapa.  Montana Field Guide.  .  Retrieved on , from