Burrs
Burs serve the plants that bear them in two main ways.
Firstly, burs tend to repel some herbivores, much as other spines and prickles do.
Secondly, plants with burs rely largely on living agents to disperse their seeds; their burs are mechanisms of seed dispersal by epizoochory (dispersal by attaching to the outside of animals), of which one form is anthropochory (dispersal by attaching to the outside of humans, usually on their clothing)
Burrs
Burs serve the plants that bear them in two main ways.
Firstly, burs tend to repel some herbivores, much as other spines and prickles do.
Secondly, plants with burs rely largely on living agents to disperse their seeds; their burs are mechanisms of seed dispersal by epizoochory (dispersal by attaching to the outside of animals), of which one form is anthropochory (dispersal by attaching to the outside of humans, usually on their clothing)