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Montana Field Guide

Montana Field Guides

Flat Pea - Lathyrus sylvestris
Other Names:  Flat Peavine, Narrow-leaved Everlasting-pea

Non-native Species

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

Agency Status


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General Description
Rhizomatous. Stems winged, climbing, 6–20 cm. Leaves with 2 lanceolate leaflets, 5–12 cm long; rachis prolonged into a tendril; stipules lanceolate, 1–3 cm long. Flowers red (drying blue); calyx tube 4–5 mm long; sepals unequal, shorter than the tube; banner ca. 15 mm long. Legume 4–6 cm long (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Ravalli and Sanders counties. Introduced as an ornamental, escaped throughout U.S.; native to Europe (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

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)


The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus appositus, Bombus fervidus, Bombus flavifrons, Bombus sitkensis, and Bombus occidentalis (Thorp et al. 1983, Colla and Dumesh 2010, Koch et al. 2012).


  • 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.
    • Koch, J., J. Strange, and P. Williams. 2012. Bumble bees of the western United States. Washington, DC: USDA Forest Service, Pollinator Partnership. 143 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 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.
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Citation for data on this website:
Flat Pea — Lathyrus sylvestris.  Montana Field Guide.  .  Retrieved on , from