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Montana Field Guide

Montana Field Guides

Glaucous Rattlesnake-root - Prenanthes racemosa

Status Under Review
Undetermined Origin

Global Rank: G5
State Rank: SU

Agency Status
MNPS Threat Rank:

External Links

General Description
Stems erect, usually simple, 50–120 cm. Herbage glabrous; the stem hispid above. Leaf blades oblong below, lanceolate and sessile above, entire to dentate, 7–40 cm long. Inflorescence racemose to narrowly paniculate. Involucre 11–12 mm high; phyllaries setose. Ray flowers 9 to 29, white to pink ligules 7–13 mm long. Achenes 5–6 mm long; pappus yellowish (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Our plants are subspecies multiflora Cronquist.

Range Comments
BC to NL south to WA, CO, MO and NY (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 1

(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 species or genera where their geographic ranges overlap: Bombus fervidus and Bombus impatiens (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.
    • 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?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
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Citation for data on this website:
Glaucous Rattlesnake-root — Prenanthes racemosa.  Montana Field Guide.  .  Retrieved on , from