INTLORESCENCE. 
79 
ed cymes in the axils of a pair of opposite leaves, as in the 
Labiate plants, have been called mrticils or whorls, A cyme 
wi^.h its flowers nearly sessile, is called a glomerale. 
Corymb (Fig. 94, a)^ or false umbel ; Fig. 94. 
here the peduncles rise from different 
hights above the main stem, but the 
lower ones being longer, they form 
nearly a level or convex top ; as the 
yarrow. The centrifugal evolution of 
the blossoms distinguishes the cyme, 
while in the corymb the evolution is 
centripetal. 
Fascicle (Fig. 94, h) has flowers on little stalks variously in- 
serted and subdivided, and collected into a close bundle nearly 
level at the top ; as the sweet-william. It is more compact than 
the cyme. 
Ilead^ or capitalum (Fig. 94, c), has sessile flowers heaped 
together in a globular form ; as in the clover, and button-bush 
{Ge/phalanthus). It may be considered either a simple umbel 
with sessile flowers, or a spike with a very short axis. The 
axis or rachis of a head is called the receptacle. The whole 
inflorescence is the product of one branch ; the lower flowers 
expand and often bear fruit, while the upper are in bud and 
the middle in full bloom ; the inflorescence is centripetal, or 
from the circumference. 
Ament,, or catkin, is an assemblage of flow- 
ers, composed of scales, and stamens or pis- 
tils, arranged along a common thread-like 
receptacle, or rachis^ as in the chestnut and 
willow. The scales of the anient are properly 
the calyces ; the whole aggregate, including 
scales, stamens or pistils, and filiform axis, 
constitutes the anient. At Fig. 95 is the 
representation of the pistillate ament of the 
poplar ; it is oblong, loosely imbricated, and 
cylindrical ; the calyx is a flat scale, deeply 
fringed. At 5 is a representation of the fer- 
tile or pistillate flower ; the calyx or bract is 
a little below the corolla, which is cup-shaped, 
of one petal, and crowned with an egg-shaped, 
pointed ovary, which is superior, and bears four (sometimes 
eight) stigmas. 
The staminate ament resembles the pistillate, except that its 
corolla incloses eight stamens, but no pistil. The poplar is in 
the class Dioecia, because the pistillate and staminate flowers 
Corj nib — Fascicle — Head — Ament. 
