American Bird's-foot Trefoil - Lotus unifoliolatus
Taprooted annual. Stems often simple, erect, 5–30 cm. Herbage villous. Leaves nearly sessile, with 3 (1 or 5) narrowly elliptic leaflets, 5–20 mm long. Inflorescence of solitary pedicellate flowers subtended by a leaflet-like bract. Flowers pale yellow; calyx tube ca. 1 mm long; sepals linear, 2–5 mm long; keel 4–8 mm long. Legume 15–35 mm long (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX
Our plants are variety helleri
BC to MN, south to CA, TX, AL and Mexico (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Observations in Montana Natural Heritage Program Database
Number of Observations:
(Click on the following maps and charts to see full sized version)
Map Help and Descriptions
(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 fervidus
, Bombus occidentalis
, Bombus pensylvanicus
, and Bombus griseocollis
(Thorp et al. 1983, Colla and Dumesh 2010, Colla et al. 2011).
- 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.
- Thorp, R.W., D.S. Horning, and L.L. Dunning. 1983. Bumble bees and cuckoo bumble bees of California (Hymenoptera: Apidae). Bulletin of the California Insect Survey 23:1-79.