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Montana Field Guide

Montana Field Guides

Rydberg's Parsley - Musineon vaginatum

Potential Species of Concern
Native Species

Global Rank: G3G4
State Rank: S3S4
(see State Rank Reason below)

Agency Status


External Links

State Rank Reason (see State Rank above)
See rank details.
  • Details on Status Ranking and Review
    Rydberg's Parsley (Musineon vaginatum) Conservation Status Review
    Review Date = 11/01/2012
    View State Conservation Rank Criteria
    Population Size

    Score1 - Moderate: Generally 10,000-100,000 individuals.

    CommentEstimated as population levels from specimen collections are largely unknown.

    Range Extent

    Score2 - Regional or State Endemic or Small Montana Range: Generally restricted to an area <100,000 sq. miles (equivalent to 2/3 the size of Montana or less) or Montana contributes 50% or more of the species’ range or populations OR limited to 2-3 Sub-basins in Montana.

    Area of Occupancy

    Score0-1 - Moderate to High. Occurs in >10 Subwatersheds (6th Code HUC’s), though the species' distribution is not sufficiently documented to place it within one class.

    Environmental Specificity

    Score0-1 - Low to Moderate.


    Score0-1 - Stable to Minor Declines:

    CommentTrends unknown, though populations are likely stable or experiencing only minor declines.


    Score0-1 - Low to Medium.

    Intrinsic Vulnerability

    Score0-1 - Low to Moderate Vulnerability.

    Raw Conservation Status Score

    Score 3 to 8 total points scored out of a possible 19.

General Description
Caulescent. Stems prostrate to ascending. 15–30 cm. Herbage glabrous. Leaves alternate; blades ovate in outline, subtripinnate; ultimate segments linear to oblong, 3–25 mm long. Umbels: peduncles 5–25 long, longer than the leaves; rays 5–40 mm long; involucel bracts 2–3 mm long. Flowers yellow or white. Mericarps 3–5 mm long, glabrous or scaberulous; oil tubes 1 to 4 per interval (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range Range Descriptions


Range Comments
Regional endemic of south-central Montana and north-central Wyoming. Reports from northern Utah (Mathias and Constance 1944) are thought to be based on misidentified specimens.

Observations in Montana Natural Heritage Program Database
Number of Observations: 48

(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)

Stony, usually calcareous soil or talus in open, often Douglas-fir forest, woodlands; valleys to subalpine (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Predicted Suitable Habitat Model

This species has a Predicted Suitable Habitat Model available.

To learn how these Models were created see

  • 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?
    • 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:
Rydberg's Parsley — Musineon vaginatum.  Montana Field Guide.  .  Retrieved on , from