Buffalo Bur - Solanum rostratum
Annual. Stems ascending to erect, branched, 10–40 cm. Herbage with stellate hairs, beset with spines on the stem and veins. Leaf blades oblong, 2–8 cm long, deeply pinnately lobed, lobes rounded, sinuate to lobed. Inflorescence several-flowered racemes, pedicels erect in fruit; peduncle 1–4 cm long, borne between the leaves. Flowers: calyx lobes 3–6 mm long, densely spiny; corolla yellow; lobes spreading, 5–10 mm long; anthers 7–9 mm long, 1 anther longer and purple. Berry 7–10 mm long, completely enclosed in the swollen calyx (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX
Sporadic throughout much of U.S. and Mexico; native to the Great Plains states, perhaps introduced west of the Divide (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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(Observations spanning multiple months or years are excluded from time charts)
The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus vagans
, Bombus auricomus
, Bombus fervidus
, Bombus terricola
, Bombus pensylvanicus
, Bombus bimaculatus
, Bombus griseocollis
, and Bombus impatiens
(Colla and Dumesh 2010, Colla et al. 2011, Williams et al. 2014, Tripoldi and Szalanski 2015).
- Literature Cited AboveLegend: View Online Publication
- Colla, S., L. Richardson, and P. Williams. 2011. Bumble bees of the eastern United States. Washington, DC: USDA Forest Service, Pollinator Partnership. 103 p.
- Colla, S.R. and S. Dumesh. 2010. The bumble bees of southern Ontario: notes on natural history and distribution. Journal of the Entomological Society of Ontario 141:39-68.
- Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
- Tripoldi, A.D. and A.L. Szalanski. 2015. The bumble bees (Hymenoptera: Apidae: Bombus) of Arkansas, fifty years later. Journal of Melittology 50: doi: http://dx.doi.org/10.17161/jom.v0i50.4834
- 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
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- Boggs, K. W. 1984. Succession in riparian communities of the lower Yellowstone River, Montana. M.S. Thesis. Montana State University, Bozeman, 107 pp.
- Eggers, M.J.S. 2005. Riparian vegetation of the Montana Yellowstone and cattle grazing impacts thereon. M.Sc. Thesis. Montana State University, Bozeman, MT. 125 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.
- Seipel, T.F. 2006. Plant species diversity in the sagebrush steppe of Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 87 p.