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Montana Field Guide

Montana Field Guides

Cusick's Desert-parsley - Lomatium cusickii

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Native Species

Global Rank: G4
State Rank: S4
(see State Rank Reason below)
C-value: 6

Agency Status


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State Rank Reason (see State Rank above)
Numerous collections from Beaverhead, Silverbow, Granite, Deer Lodge, Ravalli Counties. Most collections from populations in secure habitat.

Regional endemic of NE Oregon across Central Idaho to SW Montana.
General Description
Plants subacaulescent from a branched caudex. Herbage glabrous to slightly scaberulous. Leaf blades obovate in outline, biternate or triternate; ultimate leaflets linear, widely spaced, 1–6 cm × 1–3 mm. Umbels: peduncles ascending to erect, 3–25 cm; rays becoming unequal, 1–3 cm long; umbellets compact; involucel bracts lanceolate, 0.5–2 mm long, united below. Flowers white or ochroleucus. Mericarps oblong, glabrous, 6–12 mm long; marginal wings 0.5–1.5 mm long; oil tubes 1 or 2 per interval (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Diagnostic Characteristics
Similar to several other Lomatium species. The deep-seated root crown with elongated subterranean stems is diagnostic.

Species Range

Range Comments
OR, ID and MT (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 6

(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)

Mostly in well-drained soil at montane to subalpine elevations in open areas.

  • Literature Cited AboveLegend:   View Online Publication
    • 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?
    • Forcella, F. 1977. Flora, chorology, biomass and productivity of the Pinus albicaulis-Vaccinium scoparium association. M.S. Thesis. Bozeman, MT: Montana State University. 99 pp.
  • Web Search Engines for Articles on "Cusick's Desert-parsley"
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Citation for data on this website:
Cusick's Desert-parsley — Lomatium cusickii.  Montana Field Guide.  .  Retrieved on , from