bird’s-foot trefoils

genus Lotus

Member of small yellow peas
legume family (family Fabaceae)
dicots (class Magnoliopsida)
flowering plants (subphylum Angiospermae)

Except for historical records that I'm ignoring, there are no other wild species of this genus in the bay area.

bird’s-foot trefoil
Lotus corniculatus

bird’s-foot trefoil
Lotus corniculatus

leaflet length of longest upper leaves 1.6–3(4) × width
corolla 10–14(16) mm
very common

narrow-leaf bird’s-foot trefoil
Lotus tenuis

narrow-leaf bird’s-foot trefoil
Lotus tenuis

leaflet length of longest upper leaves (2.5)3.2–5 × width
corolla (6)7–10(12) mm
Chabot; historically rare elsewhere

2 observed taxons / 1 key

Chris’s observations: 26 (11 are research grade)

Locations:

Skyline Ridge OSP: 6
Coyote Hills RP: 3
Monte Bello OSP: 3
Butano SP: 2
La Honda Creek OSP: 2
Murray Ranch SP: 2
El Corte de Madera OSP
Long Ridge OSP
Purisima Creek Redwoods OSP
Russian Ridge OSP
Sam McDonald CP
San Pedro Valley CP
Sibley Volcanic RP
Sweeney Ridge National Recreation Area

Months:

Apr.: 1
May: 6
Jun.: 9
Jul.: 5
Aug.: 2
Sep.: 3

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Not all sites include this taxon:

genus Lotus → iNaturalist – Calflora – Jepson eFlora
not yet listed → FNA

Bay Area species: iNaturalist – Calflora