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Bitterroot Draba - Draba daviesiae
Other Names:
Draba apiculata var. daviesiae
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State Rank Reason (see State Rank above)
A Montana endemic, known from several occurrences in alpine areas of the Bitterroot Mountains. Overall abundance and distribution are still poorly known though the high elevation habitat would likely limit most potential impacts.
Details on Status Ranking and Review
Population Size
Score 2 - Small: Generally 2,000-10,000 individuals.
Range Extent
Score 3 - Local Endemic or Very Small Montana Range: Generally restricted to an area <10,000 sq. miles (equivalent to the combined area of Phillips and Valley Counties) or <6 Sub-basins (4th code watersheds) Range-wide OR limited to one Sub-basin in Montana
Area of Occupancy
Score 2 - Low: Generally occurring in 4-10 Subwatersheds (6th Code HUC’s).
Environmental Specificity
Score 1-2 - Moderate to High.
Trends
Score 0-1 - Stable to Minor Declines:
Comment Trends unknown, though populations are likely stable or experiencing only minor declines.
Threats
Score 0 - Low: Impacts, if any, to the species are expected to be minor or insignificant (affecting <10% of populations) in severity, scope and immediacy.
Comment Habitat is remote.
Intrinsic Vulnerability
Score 1 - 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
9 to 11 total points scored out of a possible 19.
General Description
Mat-forming perennial; the caudex clothed in old leaf bases. Stems simple, 1–5 cm. Basal leaves oblong, 2–5 mm long, entire. Stem leaves lacking. Vestiture of simple leaf cilia; otherwise glabrous. Petals yellow, 3–5 mm long. Fruit ascending, 4–6 mm long, 2–3 mm wide, glabrous; style 0.3–0.5 mm long; lower pedicels 3–6 mm long (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX ).We do not yet have descriptive information on this species. Please try the buttons above to search for information from other sources.
Phenology
Flowering in July and August, mature fruit in late July and August.
Species Range
Montana Range
Range Descriptions
Native
Range Comments
Montana endemic, restricted to Bitterroot Mountains in Ravalli County.
Observations in Montana Natural Heritage Program Database
Number of Observations: 24
(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
Rocky slopes and talus near or above timberline.
Ecological Systems Associated with this Species
Commonly Associated with these Ecological SystemsAlpine Systems
Threats or Limiting Factors
STATE THREAT SCORE REASON
References
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