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Montana Field Guide

Montana Field Guides

Scotch Broom - Cytisus scoparius

Noxious Weed: Priority 1B
Non-native Species

Global Rank: GNR
State Rank: SNA

Agency Status
MNPS Threat Rank:
C-value: 0

External Links

General Description
Deciduous shrubs 1–3 m. Stems strongly angled, green. Herbage glabrous to pubescent. Leaves nearly sessile, trifoliolate below, simple above; the elliptic leaflets 6–15 mm long; stipules absent. Inflorescence: 1 to 3 axillary, pedicelate flowers. Flowers papilionaceous, yellow; calyx tubular, 5–6 mm long, glabrous; sepals unequal; corolla 15–22 mm long; styles curved beyond the keel; stamens 10, 4 longer than the others. Legume linear-oblong, flattened, 25–40 mm long, ciliate on the sutures; seeds several (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Introduced as an ornamental and escaped on the east and west coasts of the U.S.; native to Europe. Known from a single Sanders County population just east of the ID border (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

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:
Scotch Broom — Cytisus scoparius.  Montana Field Guide.  .  Retrieved on , from