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Montana Field Guide

Montana Field Guides

Siberian Peashrub - Caragana arborescens

Non-native Species

Global Rank: GNR
State Rank: SNA
C-value: 1

Agency Status


External Links

General Description
Many-stemmed shrub to 4 m. Stems branched, pubescent. Leaves often fascicled, becoming glabrate, even-pinnate with 4 to 10 oblong-elliptic leaflets 1–3 cm long with rounded or truncate, mucronate tips; stipules often with nodal spines. Inflorescence of 1 to 4 flowers, fascicled on spur branches. Flowers papilionaceous, yellow; calyx pubescent, 6–7 mm long; sepals ca. 1 mm long; banner ca. 2 cm long, reflexed, barely longer than the wings and keel. Fruit a glabrous, pendent, linear-oblong legume, 3–5 cm long, narrowed to a slender beak; seeds numerous (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range Range Descriptions


Range Comments
Collected in Missoula County; native to Asia (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 22

(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)

Rarely escaping into fields, pastures, roadsides; plains; valleys (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus centralis, Bombus fervidus, Bombus huntii, Bombus griseocollis, and Bombus impatiens (Plath 1934, Thorp et al. 1983, Colla and Dumesh 2010).


  • Literature Cited AboveLegend:   View Online Publication
    • Colla, S.R. and S. Dumesh. 2010. The bumble bees of southern Ontario: notes on natural history and distribution. Journal of the Entomological Society of Ontario 141:39-68.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Plath, O.E. 1934. Bumblebees and their ways. New York, NY: Macmillan Company. 201 p.
    • Thorp, R.W., D.S. Horning, and L.L. Dunning. 1983. Bumble bees and cuckoo bumble bees of California (Hymenoptera: Apidae). Bulletin of the California Insect Survey 23:1-79.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Culver, D.R. 1994. Floristic analysis of the Centennial Region, Montana. M.Sc. Thesis. Montana State University, Bozeman. 199 pp.
    • Hale, K.M. 2007. Investigations of the West Nile virus transmission cycle at Medicine Lake National Wildlife Refuge, Montana, 2005-2006. M.Sc. Thesis. Bozeman, MT: Montana State University. 74 p.
    • Seipel, T.F. 2006. Plant species diversity in the sagebrush steppe of Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 87 p.
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Citation for data on this website:
Siberian Peashrub — Caragana arborescens.  Montana Field Guide.  .  Retrieved on , from