190 ELEMENTS OF BOTANY. 
The usefulness of burs to the plant which produces them is 
evident enough. 
I Il iit 
* Fie. 176. — Dehiscent Fruits. 
I, linear capsule of celandine ; II, pod of pea; III, capsule of thorn-apple 
or Jamestown weed. 
' Fie. 177. — Adhesive Fruits. 
At left, hound’s-tongue ; «t right, cleavers. 
Why do bur-bearing plants often carry their fruit until 
late winter or early spring? 
