FORM AND STRUCTURE 
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Fic. 38.—A Corymb. 
flowers are at the 
centre, is called a 
Cyme. 
Umbel, resembles a ra- 
ceme but the central 
axis is very short 
and the pedicels are 
nearly equal in 
length. (Fig. 39.) 
Spike, is like a raceme 
except that the flow- 
ers are sessile ; they 
sit directly on the 
central axis. 
Catkin or Ament, is like 
a spike except that 
its bracts are scales 
and the central axis 
is often 
Flowers of 
are examples. 
drooping. 
Poplar 
erect it is called a 
Thyrsus. Flowers 
of Sourwood are 
borne in a raceme. 
Corymb, is like a raceme 
except that the cen- 
tral axis is shorter 
and the lower ped- 
icels are lengthened 
so as to bring all 
the flowers to near- 
ly the same level. 
The oldest flowers 
are at the circum- 
ference (Fig. 38.) 
A flower = cluster 
similar in form, but 
in which the oldest 
Fic. 39.—Umbel of Cherry Blossoms, 
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