212 KINDS OF CYME. 
each cluster corresponds to the apex of a branch, the expansion 
of the whole is centrifugal. By attention to this order of ex- 
pansion such cymes may be always distinguished from indefinite 
kinds of inflorescence, such as the umbel or corymb, to which 
otherwise they bear in many cases a great resemblance. In the 
Chickweed (fig. 434), and many other plants, the formation of the 
secondary, tertiary, and other axes a”, a’, a’’’”’, goes on through- 
out the growing season, and in such cymes, which are usually 
of a more or less spreading nature, the centrifugal order of 
expansion may be well observed. 
Fic. 437. 
Fig. 436. Spiked cyme of Sedum, This is re- 
garded by Sachs as a form of monochasial, 
uniparous, or unilateral cyme.— Fig. 437. 
Racemose cyme of a species of Campanula. 
a’, Primary axis terminated by a flower, 7’, 
which is already withering. «a, a’, a’. 
Secondary axes, each ending in a flower, 
iit, Gee 
The above cymes are sometimes characterised according to 
the number of their branches : thus they are dichotomous, as in 
the common Centaury (jig. 435), when the primary axis @’ is 
terminated by a flower 7’, at the base of which are two bracts, 
each of which develops in its axil secondary axes a”, a”, 
ending in single flowers, f’, f’ ; and at the base of each of 
these flowers “there are also two other bracts, from which 
tertiary axes a’”’, a’”’”, are developed, also terminated by flowers 
Pent, Bnd AO on, and as the division in this case always takes 
place into two branches, the cyme is said to be dichotomous. 
The cyme of the Chickweed (fig. 434) is also dichotomous. 
The dichotomous cyme is also called a biparous cyme or dicha- 
sium. This is not a true dichotomous branching (see page 
