chile trefoil

Acmispon wrangelianus

Member of deervetch (genus Acmispon)
small yellow peas
legume family (family Fabaceae)
dicots (class Magnoliopsida)
yellow in flowering plants

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• generally prostrate, branched at base, 5–30 cm
• generally 4 leaflets, palmate or nearly so, 4–15 mm, elliptic to obovate
• 1 flower 1 per leaf axil
• ± no peduncle and no bracts, so flower is sessile above a normal set of leaflets
• calyx strigose [often looks glabrous]
• calyx lobes ± 0.8–1.2 × tube
• corolla 5–9 mm, yellow, reddening in age, wings ± ≤ keel
• very common
• see also bur clover (Medicago polymorpha), which has 3 leaflets instead of generally 4

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Chris’s observations: 19 (10 are research grade)

Locations:

• Edgewood Park & Natural Preserve: 5
• Calero CP: 3
• Máyyan 'Ooyákma Coyote Ridge OSP: 2
• Pleasanton Ridge RP: 2
• Santa Teresa CP: 2
• Sierra Azul OSP: 2
• Fort Ord NM
• Joseph D. Grant CP
• Waterdog Lake & Open Space

Months:

• Feb.: 1
• Mar.: 7
• Apr.: 9
• May: 2

For more details, use advanced search.

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Not all sites include this taxon:

• Acmispon wrangelianus → iNaturalist – Calflora – CalPhotos – Jepson eFlora
• not yet listed → FNA

Bay Area species: iNaturalist – Calflora