Roughly hairy, sprawling densely leafy, aromatic shrub up to 1m, sometimes sparsely-woolly on young parts. Leaves oval to lance-shaped, margins rolled under and usually sharply toothed, pungent when bruised; bears solitary, radiate flowers at branch tips, with yellow rays and disc; fruits are kidney-shaped, warty and pitted, with a small cavity on one side, 4-5mm long.