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Montana Field Guide

Montana Field Guides

Straightbeak Buttercup - Ranunculus orthorhynchus

Species of Concern

Global Rank: G5
State Rank: S1S2
* (see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank: 1
C-value: 8

External Links






State Rank Reason (see State Rank above)
Rare in Montana, where is is known from the western portion of the state based upon several specimen collections. However, only one collection has been made in the past two decades. Additional data are need to determine this species' status.
  • Details on Status Ranking and Review
    Straightbeak Buttercup (Ranunculus orthorhynchus) Conservation Status Review
    Review Date = 05/21/2013
    View State Conservation Rank Criteria
    Population Size

    Score2-3 - Very Small to Small: Population size is imprecisely known but is believed to be <10,000 individuals.

    Commentpopulation estimates from known locations are unavailable.

    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.

    CommentMost observations/collections are at least several decades old, thus the species' current distribution is uncertain.

    Area of Occupancy

    Score2-3 - Very Low to Low. Occurs in 10 or fewer Subwatersheds (6th Code HUC’s), though the species' distribution is not sufficiently documented to place it within one class.

    CommentMost observations/collections are at least several decades old, thus the species' current distribution is uncertain.

    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).

    Trends

    ScoreNA - Rank factor not assessed.

    Threats

    Score2-3 - High to Very High.

    CommentInvasive species and trampling have been identified as real or potential threats.

    Intrinsic Vulnerability

    Score1 - Moderate Vulnerability: Specific biological attributes, unusual life history characteristics or limited reproductive potential makes the species susceptible to extirpation from stochastic events or other adverse impacts to its habitat and slow to recover.

    Raw Conservation Status Score

    Score 10 to 13 total points scored out of a possible 16 (Rarity factors and threats only).

 
General Description
Stems 20–75 cm, somewhat hollow, erect or decumbent with hirsute to nearly glabrous foliage. Basal leaf blades narrowly ovate, 3–15 cm long, pinnate, the 3 to 5 leaflets deeply 1 to 2 times lobed. Flowers with petals 9–14 mm long, almost twice as long as the pilose sepals. Achenes flattened, 2–4 mm long, glabrous with straight beak ca. 3 mm long; head ovoid, 8–12 mm high (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Phenology
Flowering from June-early August.

Species Range
Present
 


Range Comments
AK south to CA, UT and WY (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 6

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Streambanks and moist meadows in the montane zone.

Ecological Systems Associated with this Species

References
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Citation for data on this website:
Straightbeak Buttercup — Ranunculus orthorhynchus.  Montana Field Guide.  .  Retrieved on , from