Acmispon americanus, known by the common names American bird's-foot trefoil and Spanish clover, is a species of legume native to most habitats of California, the Western United States, Western Canada, and northern Mexico.
The plant is an upright hairy annual, growing to 25 cm. The flowers (to 6mm) are pale pink to cream.
Acmispon americanus is often discussed as comprising several varieties, including:
- Integrated Taxonomic Information System (ITIS) (https://www.itis.gov) 6.23.2013
- USDA . accessed 8.2.2013
- "Lotus unifoliolatus". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 23 June 2015.
- CalFlora Database: Acmispon americanus var. americanus
- Jepson eFlora: Acmispon americanus var. americanus
- CalFlora Database: Acmispon americanus
- Jepson eFlora: Acmispon americanus — TJM2 (2012)
- Jepson Manual Treatment: Lotus purshianus — JM93 (1993)
- USDA Plants Profile for Lotus unifoliolatus (American bird's-foot trefoil)
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