Narrow-leaf Bird's-foot Trefoil

Lotus tenuis

"Lotus tenuis" is a flowering plant of the pea family Fabaceae, native to western and southern Europe and southwest Asia. It has become naturalised in many other locations, including the Pampas of Argentina, and parts of the United States.
trefoil flowers  Lotus tenuis,lotus tenuis

Naming

Common names include narrowleaf trefoil, narrow-leaved bird's-foot-trefoil, slender trefoil", "creeping trefoil, or prostrate trefoil.

Some botanists treat it as a subspecies of "Lotus corniculatus", as "L. corniculatus" subsp. "tenuifolius".

References:

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Taxonomy
KingdomPlantae
DivisionAngiosperms
ClassEudicots
OrderFabales
FamilyFabaceae
GenusLotus
SpeciesL. tenuis