lesser hop trefoil

Trifolium dubium

Member of clovers (genus Trifolium)
legume family (family Fabaceae)
dicots (class Magnoliopsida)
yellow in flowering plants

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• Leaflets: 3, pinnate, petioles of mid-leaves generally < leaflets
• inflorescence: head- to ± spike-like, 4–8 mm wide, 5–10(20)-flowered; flowers quickly reflexed
• corolla: 3.5–4 mm, bright yellow, brown in age, weak-striate
• looks similar to black medick (Medicago lupulina), but lesser hop trefoil has the following characteristics:
• leaf is hairy only abaxially along the main vein, does not have a distinct tip
• curved fruit is exposed, black when ripe

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Chris’s observations: 14 (all are research grade)

Locations:

• Edgewood Park & Natural Preserve: 3
• Henry Coe SP: 3
• Calero CP: 2
• Long Ridge OSP
• Sanborn CP
• Sierra Azul OSP
• Stevens Creek CP
• Sunol Wilderness RP
• UCSC Campus Natural Reserve

Months:

• Mar.: 1
• Apr.: 5
• May: 7
• Jun.: 1

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Not all sites include this taxon:

• Trifolium dubium → iNaturalist – Calflora – CalPhotos – Jepson eFlora
• not yet listed → FNA

Bay Area species: iNaturalist – Calflora