[Deervetch, Birdsfoot-trefoil and Lotus: The Genera Acmispon, Hosackia and Lotus East of the Cascade Mts. of Oregon and Washington]
American Bird's-foot Trefoil, Pursh's Lotus, Spanish-clover
Acmispon americanus var. americanus
Synonyms: Hosackia americana, Lotus americanus, Lotus purshiana, Lotus purshianus var. glaber, Lotus purshianus var. glabra, Lotus purshiana var. purshiana, Lotus unifoliolatus, Lotus unifoliolatus var. unifoliolotus
![Flower of American Bird's-foot Trefoil, Pursh's Lotus, Spanish-clover: Acmispon americanus var. americanus (Synonyms: Hosackia americana, Lotus americanus, Lotus purshiana, Lotus purshianus var. glaber, Lotus purshianus var. glabra, Lotus purshiana var. purshiana, Lotus unifoliolatus, Lotus unifoliolatus var. unifoliolotus)](purshiana/unifoliolatus4a.jpg)
A close-up of the flower of american bird's-foot trefoil as seen along Soda Springs Road in the Klickitat State Wildlife Area....................June 28, 2009.
-- ![Sideview of flower of American Bird's-foot Trefoil, Pursh's Lotus, Spanish-clover: Acmispon americanus var. americanus (Synonyms: Hosackia americana, Lotus americanus, Lotus purshiana, Lotus purshianus var. glaber, Lotus purshianus var. glabra, Lotus purshiana var. purshiana, Lotus unifoliolatus, Lotus unifoliolatus var. unifoliolotus)](purshiana/unifoliolatus4d.jpg)
Frontal and profile views of the flower of american bird's-foot trefoil as seen along Soda Springs Road in the Klickitat State Wildlife Area.......June 28, 2009.
![Leaf of American Bird's-foot Trefoil, Pursh's Lotus, Spanish-clover: Acmispon americanus var. americanus (Synonyms: Hosackia americana, Lotus americanus, Lotus purshiana, Lotus purshianus var. glaber, Lotus purshianus var. glabra, Lotus purshiana var. purshiana, Lotus unifoliolatus, Lotus unifoliolatus var. unifoliolotus)](purshiana/unifoliolatus4b.jpg)
Leaflets of american bird's-foot trefoil as seen along Soda Springs Road in the Klickitat State Wildlife Area........June 28, 2009.
- ![American Bird's-foot Trefoil, Pursh's Lotus, Spanish-clover: Acmispon americanus var. americanus (Synonyms: Hosackia americana, Lotus americanus, Lotus purshiana, Lotus purshianus var. glaber, Lotus purshianus var. glabra, Lotus purshiana var. purshiana, Lotus unifoliolatus, Lotus unifoliolatus var. unifoliolotus)](purshiana/americanus07-04-2018b.jpg)
American bird's-foot trefoil as seen on Missoula Flood sandbars between Five Mile and the Little Spokane River, Spokane County, WA........July 4, 2018.
Paul Slichter