82 PLANT RELATIONS. 



very common for them to branch, so that the flowers appear 

 in clusters, sometimes loose and spray-like, sometimes com- 

 pact (see Pigs. 75, TO, 77). For example, the common 



Fig. 7G. a flower cluster from a walnut tree. — After Steasbtjrgeb. 



dandelion " flower " is really a compact head of flowers. 

 All of this branching has in view better arrangements for 

 pollination or for seed-distribution, or for both. 



The subject of pollination :ind seed-distribution will be 

 considered under the head of reproduction. 



