Acmispon americanus (Nuttall) Rydberg. Western Prairie-trefoil. Phen: Mid May-Aug. Hab: Prairies, glades, bluff-tops, roadsides; eastwards a waif, as near wool waste-combing mills, other disturbed areas. Dist: MB and SK south to w. LA and c. TX; also BC south to s. CA, AZ, NM, and Mexico.

Origin/Endemic status: Native

Synonymy: = Acmispon americanum – S, orthographic variant; = Acmispon americanus (Nutt.) Rydb. var. americanus – FNA11.1, K3, K4, NY; = Lotus americanus (Nutt.) Bisch. – S13; = Lotus purshianus F.E. & E.G.Clem. var. purshianus – C, SE3, Isely (1981), Isely (1998); = Lotus unifoliolatus (Hook.) Benth. var. unifoliolatus – Ar, K1, NE; = n/a – RAB; < Lotus americanus (Nutt.) Bisch. – F; < Lotus purshianus F.E. & E.G.Clem. – G, GrPl, Tx; < Lotus unifoliolatus (Hook.) Benth. – Il, NcTx

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FACU (name change)
• Eastern Mountains and Piedmont: FACU (name change)
• Great Plains: FACU (name change)
• Midwest: FACU (name change)
• Northcentral & Northeast: FACU (name change)

Heliophily: 9