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Woolly Prince's plume - Stanleya tomentosa
State Rank Reason (see State Rank above)
Stanleya tomentosa is a regional endemic in Carbon County, Montana and adjacent north-central Wyoming. Population counts have been poorly documented and inconsistently collected. It is presumed that the state population has at least 3,000 plants, and could be well over 10,000. Population trends are unknown, though the species' habitat is largely intact and in good condition. Threats have not been identified though changes in climate patterns could negatively impact populations in the state.
Surveys that bring forth current data on population parameters, habitat conditions, mapping, and potential threats are needed. Monitoring at a subset of occurrences is necessary to track population trends and assign a timely and accurate state conservation status rank. Additional surveys on lands modelled as predicted suitable habitat are also needed to better understand the species' distribution in the state.
General Description
Perennial (monocarpic?) from a simple or few-branched caudex covered in old leaf bases. Stems erect, simple, 40–120 cm. Leaves basal and cauline; basal leaves petiolate, 10–30 cm long, oblanceolate, pinnately lobed, the terminal lobe largest; stem leaves similar below, becoming entire above. Vestiture of dense long, simple hairs at least below. Petals pale yellow, 10–15 mm long, glabrous. Fruit slightly curved, 3–8 cm long, constricted between the seeds; the stipe 15–25 mm long; pedicels spreading, 10–15 mm long (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Species Range
Montana Range
Range Descriptions
Native
Range Comments
Regional endemic; in Wyoming known from the Big Horn Basin and the foothills of the Absaroka, Big Horn, Bridger, and Owl Creek mountains in Big Horn, Fremont, Hot Springs, and Park counties.
Observations in Montana Natural Heritage Program Database
Number of Observations: 76
(Click on the following maps and charts to see full sized version)
Relative Density
Recency
(Observations spanning multiple months or years are excluded from time charts)
Habitat
Open, gravelly soil of slopes and flats in sagebrush grassland, desert shrubland, and juniper woodland in the valley and foothill zones.
Stewardship Responsibility
Threats or Limiting Factors
Reported threats to Montana's populations of Woolly Prince's Plume have not been identified.
Climate change could pose a potential risk to the state's populations; however, field-based data on the timing and magnitude are not available.
References
- 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?- Lesica, P. and P.L. Achuff. 1992. Distribution of vascular plant species of special concern and limited distribution in the Pryor Mountain desert, Carbon County, Montana. Unpublished report to the Bureau of Land Management. Montana Natural Heritage Program, Helena, MT. 105 pp.
- Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
- Rollins, R. C. 1993. The Cruciferae of Continental North America: systematics of the mustard family from the Arctic to Panama. Stanford University Press, Stanford, California. 976 pp.
- Web Search Engines for Articles on "Woolly Prince's plume"
