Acmispon parviflorus

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  • Scientific Name: Acmispon parviflorus
  • Family: Fabaceae
  • Common Names: small-flowered bird's-foot trefoil
  • Synonyms/Misapplications: Hosackia parviflora, Lotus micranthus
  • Codon: ACMPAR

Photo by Ben Legler, 2003. Also featured on Main Page


Scientific classification
Kingdom: Plantae
Subkingdom: Viridiplantae
Phylum: Tracheophyta
Subphylum: Spermatophytina
Class: Magnoliopsida
Subclass: Rosanae
Order: Fabales
Family: Fabaceae
Genus: Acmispon Raf.
Species: Acmispon parviflorus (Benth.) D.D. Sokoloff



Glabrous, annual herb to 3 dm tall with axillary, cream to yellow papilionaceous flowers.[2] Stems erect to prostate, often branching near base.[3] Leaves irregularly pinnate to palmate, 3 to 5-foliate, stipules reduced to absent.[4] Calyx teeth shorter than or equal to tube; corolla cream to yellowish; stamens 10, diadelphous; ovary simple, superior.[2] Pods are strongly constricted.[2]

Bloom Period

April to September[3]


West of the Cascades, British Columbia to California; also the Columbia River Gorge.[3]


Sandy soils, open areas; flat to sloped.[2]

Photo Gallery


  1. Integrated Taxonomic Information System. Retrieved from
  2. 2.0 2.1 2.2 2.3 Hitchcock, C. L., Cronquist, A., Giblin, D., & Legler, B. et al. (2018). Flora of the Pacific Northwest: an illustrated manual. Seattle: University of Washington Press, p. 128.
  3. 3.0 3.1 3.2 WTU Herbarium, Burke Museum, & University of Washington. Retrieved from
  4. Jepson Herbarium Online Flora. Retrieved from