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Sharptip Sandwort - Arenaria congesta var. cephaloidea
Other Names:
Eremogone congesta var. cephaloidea
General Description
Perennial from a branched caudex, forming loose mats. Stems erect, simple, 5–30 cm. Leaves filiform, flexuous or rigid, glabrous, 2–8 cm long, shorter above. Inflorescence many-flowered, congested, glabrous; pedicels less than 0.5 mm long. Flowers: sepals glabrous, ovate to lanceolate, scarious-margined, 3–6 mm long, apex acute to acuminate and sharp; petals oblong, 5–8 mm long. Capsules glabrous, 3–6 mm long (adapted from
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Diagnostic Characteristics
Variety cephaloidea is diagnosed from the other two varieties in Montana by its congested, capitate inflorescence, and the sharp narrow apices of the sepals (Hartman et al. 2005, Fl. North America, Vol. 5).
Range Comments
Most widespread in ID but also in WA, southern and northeast OR, and Sanders, Gallatin and Fergus counties in MT (Kartesz 2009).
Observations in Montana Natural Heritage Program Database
Number of Observations: 2
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Relative Density
Recency
(Observations spanning multiple months or years are excluded from time charts)
Habitat
Open, gravelly woods; 300-1000 m (Hartman et al. 2005, Fl. North America, Vol. 5).
Ecology
POLLINATORS The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap:
Bombus melanopygus and
Bombus sylvicola (Wilson et al. 2010, Koch et al. 2012, Williams et al. 2014).
References
- Literature Cited AboveLegend:
View Online Publication
Koch, J., J. Strange, and P. Williams. 2012. Bumble bees of the western United States. Washington, DC: USDA Forest Service, Pollinator Partnership. 143 p.- Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
- Williams, P., R. Thorp, L. Richardson, and S. Colla. 2014. Bumble Bees of North America. Princeton, NJ: Princeton University Press. 208 p.
- Wilson, J.S., L.E. Wilson, L.D. Loftis, and T. Griswold. 2010. The montane bee fauna of north central Washington, USA, with floral associations. Western North American Naturalist 70(2): 198-207.
- Additional ReferencesLegend: View Online Publication
Do you know of a citation we're missing?- Forcella, F. 1977. Flora, chorology, biomass and productivity of the Pinus albicaulis-Vaccinium scoparium association. M.S. Thesis. Bozeman, MT: Montana State University. 99 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.
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