Birds-Foot Trefoil Lotus corniculatus
Birds-foot trefoil is a perennial lawn weed and is also a member of the clover family. It can be a major problem on UK lawns as it forms large patches, it has a deep root system and spreads by both stolons and rhizomes (above and underground runners)
Like clover, the leaf has 3 leaflets on a short stalk with two more leaflets at the base of the stalk which can grow knee high if left alone.
The flowers are bright yellow and pretty and resemble those of the Honeysuckle. They can be seen from late April until late September. Birds-Foot Trefoil can tolerate a wide variety of soil types but prefers non acidic, dry soils.