It originated in Central and South America and is now found in New South Wales, South Australia, Victoria and Queensland. It is suspected of poisoning cattle. The numerous spiny burrs can also be a problem in residential areas.
Khaki weed is a creeping perennial spreading vegetatively and by seed.
Roots often form at the nodes of the spreading stems. Seeds germinate in the spring forming a dense matt of stem and leaf growth during summer if moisture is adequate. The top growth dies off in winter and the dormant plant is sustained by the fleshy taproot. New growth occurs in spring followed by flowers and seeds. Burrs are carried by stock, vehicles and in chaff and hay.