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Syrmatium prostratum, synonyms Lotus nuttallianus and Acmispon prostratus, is a species of legume native to California and northwestern Mexico. It is known by the common names beach lotus, Nuttall's lotus, and wire bird's-foot trefoil. It is native to Baja California and just into San Diego County, California, where it is a resident of coastal habitats, such as beaches and bluffs.
This is an annual herb lined with leaves made up of oval leaflets one half to one centimeter long. The inflorescence bears 3 to 8 red and yellow flowers each about a centimeter in length. The fruit is a slender, curved legume pod containing usually 2 small beanlike seeds.
- "Syrmatium prostratum Greene", Plants of the World Online, Royal Botanic Gardens, Kew, retrieved 2018-02-05
- Brouillet, Luc (2012), Jepson Flora Project, ed., "Acmispon prostratus", Jepson eFlora, Regents of the University of California, retrieved 2018-02-06
- City of San Diego Planning Department Archived 2011-06-14 at the Wayback Machine.
- California Native Plant Society Rare Plant Profile
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