 The informal names 'wobbles' and 'rickets' were used by the settlers, describing the effect on cattle allowed to graze on them.This affliction of the introduced mammal, the result of ingesting the leaves, began with paralysis of the rear quarters and resulted in their death, leading the settlers to attempt eradication of the species where they grazed.The toxins contained in the cone and other parts of the plant, macrozamin and cycasin, are produced in coralloid roots by nitrogen-fixing cyanobacteria.