An upright shrub to 2 metres, though usually much less. Leaves are trifoliate, composed of three roughly oval-shaped leaflets. Produces typical ‘pea’ flowers, which are yellow with orange, red, purple and/or brown markings. These are often produced in dense clusters and are followed by pods which turn grey at maturity, each carrying 1-3 (usually 2) seeds. Occurs often in drainage lines, where it may form dense stands.