SUMMER WILD FLOWERS 265 
arranged in flat-topped clusters, 
either heads or umbels. 
The clustering of the flowers 
is directly related to visitation 
by insects, the distributors of 
their pollen. Close grouping 
__ greatly economizes labor on the 
ieee Ce Dart OF Eheir wider: A ‘hee 
must pass from one pea flower 
to others by separate flights, but a score of flowers massed 
together into a clover head may be visited without interven- 
ing flight, and with only a slight 
turning of the body about while 
standing on the top of the cluster. 
While insects are most abundant in 
the summer season, flowers most 
abound then, also; and there is mc. 105. side view of the ab- 
competition for the services of the Costa erie bee showate zouen 
bees. 
Their patronage is desired. So the flowers in their natural 
evolution have perfected ways of drawing visitors, that 
singularly parallel the methods of the corner grocery in 
drawing trade. First, they get in a stock of 
desirable goods—nectar and pollen. Then they 
advertise that they have got it and are ready 
for business. They advertise with bright colors 
and attractive odovs. Their signs are showy 
corollas that often bear special “guide marks” 
about the entrance. Then they array their 
wares to suit their visitors’ convenience. They 
set their open corollas all out in line on a nar- 
row spike as at a common counter; or, they 
Fis. 106.| Pol- spread them out flatwise in a head or corymb 
len -gathering 
hairsfromthe or umbel, as on a common table. This last 
ney bee. 
