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Montana Field Guide

Montana Field Guides

Smoother Sweet-cicely - Osmorhiza longistylis

Native Species

Global Rank: G5
State Rank: SNR
C-value: 6

Agency Status


External Links

General Description
Stems ascending to erect, 20–60 cm. Herbage sparsely hirsute, aromatic. Leaves biternate; leaflets 2–8 cm long, coarsely serrate to lobed. Umbels: peduncles becoming 3–10 cm long; rays ascending, 1–5 cm long; involucral bracts 1 to several, lanceolate, serrate, 5–15 mm long; involucel bracts 3–10 mm long. Flowers white; stylopodium conic. Mericarps sparsely hispid, linear-oblong, 10–15 mm long, concavely narrowed to the tip; style 2–3 mm long, reflexed (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range Range Descriptions


Range Comments
SK to QC south to CO, TX and GA (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 11

(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 impatiens (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.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • DuBois, K.L. 1979. An inventory of the avifauna in the Long Pines of Southeastern Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 113 p.
    • Jones, W. W. 1901. Preliminary flora of Gallatin County. M.S. Thesis. Bozeman, MT: Montana State College. 78 pp.
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Citation for data on this website:
Smoother Sweet-cicely — Osmorhiza longistylis.  Montana Field Guide.  .  Retrieved on , from