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Montana Field Guide

Montana Field Guides

Clustered Broomrape - Orobanche fasciculata

Native Species

Global Rank: G4G5
State Rank: S4
(see State Rank Reason below)

Agency Status
MNPS Threat Rank:

External Links

State Rank Reason (see State Rank above)
Numerous collections at MONTU from Toole, Glacier, Teton, Ravalli, Beaverhead, Powder River, Phillips, Garfield, Broadwater...and others.

Usually present in small numbers, but may have a lengthy dormancy period while living off their hosts.

Found over a very wide area of Montana.
  • Details on Status Ranking and Review
    Clustered Broomrape (Orobanche fasciculata) Conservation Status Review
    Review Date = 07/23/2012
    View State Conservation Rank Criteria
    Population Size

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

    CommentPopulation size is estimated.

    Range Extent

    Score0 - Widespread species within Montana (occurs in 5% or more of the state or generally occurring in 6 or more sub-basins.) as well as outside of Montana.

    Area of Occupancy

    Score0 - High: Occurs in >25 Subwatersheds (6th Code HUC’s).

    Environmental Specificity

    Score1 - Moderate: Species is restricted to a specific habitat that is more widely distributed or to several restricted habitats and is typically dependent upon relatively unaltered, good-quality habitat (C Values of 5-7).


    Score1 - Minor Declines: Species has experienced declines of 10-30% in population size, range extent and/or occupied area in the recent past (approximately 30 years).

    CommentTrends are undocumented but likely to be declining due to reductions in sagebrush.


    Score1 - Medium: 11-30% of the populations are being negatively impacted or are likely to be impacted by one or more activities or agents, which are expected to result in decreased populations and/or habitat quality and/or quantity.

    Intrinsic Vulnerability

    Score1-2 - Moderate to High Vulnerability.

    Raw Conservation Status Score

    Score 5 to 6 total points scored out of a possible 19.

General Description
Stems 3–8 cm above ground. Herbage yellow to purplish, glandular-puberulent. Inflorescence a short, bracteate, glandular raceme of 3 to 10 flowers; pedicels erect, 2–8 cm long. Flowers: calyx 7–10 mm long; sepals deltoid, 3–6 mm long; corolla 15–30 mm long, brownish-red, yellow within the mouth, the lobes 2–6 mm long. Capsule 10–13 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
YT south to Mexico, OK and IN (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 47

(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)


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Citation for data on this website:
Clustered Broomrape — Orobanche fasciculata.  Montana Field Guide.  .  Retrieved on , from