Upright or spreading shrub or small tree to 6 metres in height. The drooping ‘leaves’ (phyllodes) are long (to 16 centimetres), straight or slightly curved and usually somewhat rounded at the tip. Unlike A. implexa, which it often resembles, A. difformis has two long-itudinal veins, though the midvein is more prominent. The globular yellow flower heads are produced in clusters from the phyllode bases or (rarely) the ends of branches. The pods reach 20 cm in length but are usually around 0.5 cm in width. They may be straight or slightly curved and are said to resemble strings of beads (moniliform).