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Montana Field Guide

Montana Field Guides

Idaho Gumweed - Grindelia nana
Other Names:  Grindelia hirsutula [in part]

Native Species

Global Rank: G5
State Rank: SNR

Agency Status
MNPS Threat Rank:
C-value: 3

External Links

General Description
Perennial branched from the caudex. Stems erect, branched above, 10–40 cm. Herbage glabrate, glandular-punctate. Leaf blades oblanceolate, 1–6 cm long, mostly entire; basal sometimes present at flowering. Involucres 7–10 mm high. Rays 12 to 25; ligules 4–10 mm long. Disk corollas 4–5 mm long. Achenes 4–6 mm long, top margin knobby; pappus awns 2 or 3 (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Throughout most of temperate North America (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).


The following animal species have been reported as pollinators of this species or genera where their geographic ranges overlap: Bombus bifarius, Bombus fervidus, Bombus flavifrons, Bombus rufocinctus, Bombus sylvicola, and Bombus occidentalis (Thorp et al. 1983, Williams et al. 2014).

  • Literature Cited AboveLegend:   View Online Publication
    • 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.
    • Williams, P., R. Thorp, L. Richardson, and S. Colla. 2014. Bumble Bees of North America. Princeton, NJ. Princeton University Press.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Bartoli, Adriana, and Roberto D. Tortosa. 2012. "Revision of the North American Species of Grindelia (Asteraceae) 1". Annals of the Missouri Botanical Garden. 98 (4): 447-513.
    • 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:
Idaho Gumweed — Grindelia nana.  Montana Field Guide.  .  Retrieved on , from