INFLORESCENCE 47 
terminates in a single flower, and ceases to grow in length ; 
further growth therefore can take place only by lateral 
branching. The lateral 
branches in the same 
way terminate in a 
single flower, and cease 
to grow in length. 
The differences be- 
tween this type and 
the preceding are: 
1. The flowers are 
terminal, not only 
lateral. | 
2. The growth in 

Fig. 47. —InpkE- Fic. 48.—Derinite 
length of each flower- — rrnire_ INFLORES- INFLORESCENCE 
ing branch is arrested. nate (diagram- (diagrammatic). 
3. The youngest The numbers I, II, ITI, etc., indicate the 
flowers are towards the order of development of the flowers, 
outside. 
This mode of inflorescence is therefore called determinate or 
definite, and the term cymose is also applied to it. 
Racemose + racemose inflorescences vary considerably | 
Inflorescences. owing to the difference in length of the primary 
stem and of the flower stalks. 
The raceme proper. Here the flowers have stalks, and are 
developed laterally along the main axis, one above the other, 
the youngest being nearest the apex, ¢.g., foxglove (Plate IL., 
Fig. 54). The bracts belonging to the flower are often absent, 
as in the wallflower ; they may be seen in the hyacinth. 
In the spike the flowers have either no stalks or very short 
ones, and the flowers are crowded together on the main axis— 
e.g. plantain (Plate IL, Fig. 51). In both the raceme and 
the spike the primary axis is elongated: in the umbel and 
capitulum it is shortened. In the wmbel the apex of the main 
stem gives off a number of branches, each bearing a flower 
with a stalk of its own. The bracts beneath the flower stalks 
form a characteristic involucre. This is the simple umbel, 
