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Montana Field Guides

Cusick's Desert-parsley - Lomatium cusickii

Native Species

Global Rank: G4
State Rank: S4
(see State Rank Reason below)

Agency Status
MNPS Threat Rank:
C-value: 6

External Links

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 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 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 14

(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.

  • Additional ReferencesLegend:   View Online Publication
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    • 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.
    • 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:
Cusick's Desert-parsley — Lomatium cusickii.  Montana Field Guide.  .  Retrieved on , from