82 PLANT STUDIES 
very common for them to branch, so that the flowers appear 
in clusters, sometimes loose and spray-like, sometimes com- 
pact (see Figs. 75, 76, 77). For example, the common 
FIG. 76. A flower cluster from a walnut tree. After STRASBURGEK. 
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 and seed-distribution will be 
considered under the head of reproduction. 
