REPRODUCTIVE ORGANS 



11^ 



i?'lG. 1:^0. AcomuiuD tiiiiibleweed (t'^fVfVowa). 



of pine and cataliia. Plumes and tufts of hairs are devel- 

 oped Ijy the seed-lilie fruits of dandelion, thistle, and very 

 niany of their relatives, and hy the seeds of the milkweed 

 (see Figs. 111. ll"'. 113, 114). On plains, or level stretehes, 

 where winds are 

 strong, a cui'ious 

 habit of seed dis- 

 persal has been de- 

 velo])ed hy certain 

 plants known as 

 ■■ tumbleweeds '" or 

 '■ '' field r Hers." 

 These plants are 

 profusely branching 

 annuals with a small , 



Fjg. til. The 3-va]ved fruit of violet discharging 

 root system in a its seeds.— After Beal. 



