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Dwarf Goldenweed - Ericameria nana
Other Names:
Haplopappus nanus
State Rank Reason (see State Rank above)
Known from one 1952 collection south of Upper Red Rock Lake.
General Description
Dwarf Goldenweed is a low shrub with rigid, intricately branched stems that are up to 3 dm high. The spreading, alternate, entire-margined leaves are linear to narrowly lance-shaped, 10-15 mm long, and occur on the upper half of the stems. Clusters of much smaller leaves are borne in principal leaf axils. The stems and foliage are resinous. Few to several flower heads are borne on short stalks on the stem tips. Each head is 6-9 mm high and has 4-6 overlapping series of straw-colored, narrow involucral bracts with pointed green tips. The 3-10 yellow rays are 2-4 mm long, while the 4-10 yellow disk flowers are 4-7 mm long. The elongate achenes are glabrous to short-hairy and topped by numerous, white to tan bristles, forming a pappus of unequal length.
Phenology
Flowering in August.
Diagnostic Characteristics
The narrow leaves and varnished appearing foliage separate this species from other shrubby Haplopappusin our area. Species of Chrysothamnus either have larger leaves or stems closely covered with dense, white hair.
Species Range
Montana Range
Range Descriptions
Historical
Range Comments
Eastern OR to southwest MT, south to CA, NV and UT. Peripheral.
Observations in Montana Natural Heritage Program Database
Number of Observations: 1
(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
Dry, rocky soil and talus slopes in or near the montane zone.
Ecology
POLLINATORS The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap:
Bombus bifarius,
Bombus centralis,
Bombus huntii, and
Bombus melanopygus (Williams et al. 2014).
References
- Literature Cited AboveLegend:
View Online Publication
Williams, P., R. Thorp, L. Richardson, and S. Colla. 2014. Bumble Bees of North America. Princeton, NJ: Princeton University Press. 208 p.
- Additional ReferencesLegend: View Online Publication
Do you know of a citation we're missing?- Culver, D.R. 1994. Floristic analysis of the Centennial Region, Montana. M.Sc. Thesis. Montana State University, Bozeman. 199 pp.
- Hall, H.M. 1928. The genus Haplopappus, a phylogenetic study in the compositae. Carnegie Institution of Washington Publication No. 389, Washington D.C. 391 pp.
- Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
- 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.
- Quire, R.L. 2013. The sagebrush steppe of Montana and southeastern Idaho shows evidence of high native plant diversity, stability, and resistance to the detrimental effects of nonnative plant species. M.Sc. Thesis. Bozeman, MT: Montana State University. 124 p.
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