An annual growing to 0.5m, it flowers from May to October, and the seeds ripen from July to October. The yellow, self-fertile, nectar-rich flowers are carried in a round head and are a good food source for bees and butterflies.
The leaves are similar to Clover which is a relative but the terminal leaflet has a short stalk. A member of the pea Family, the plant can fix atmospheric Nitrogen and can grow in most types of soil.
A poultice of the chopped plant has been applied to cuts to stop bleeding.

Not a major problem and can be attractive in wild meadows. Sometimes infests lawns which have low fertility. Treat as for Clover. See also Birdsfoot Trefoil.

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