194. SOUTH AFRICAN BOTANY 
country, quite spoiling the wool of sheep, that it has 
been found necessary to impose a heavy fine on any 
farmer who allows it to grow on his land. 
This order is generally considered the most highly 
developed of all, as it is certainly the most successful. 
Some of the reasons for its success are :— 
Fia, 108. 
A. Tubular floret of a Senecio. B. The same, divided longitudinally. 
C. Ligulate floret of same. 
(1) The massing of the flowers in heads which secures 
greater conspicuousness and a saving of material in 
corollas, etc. Also one insect can fertilize many flowers 
in a short time without having to fly from one to the 
other. 
(2) The very effective pollination arrangements, honey 
