XXxii INTRODUCTORY LESSONS. 
to be Perigynous ; or the stamens may grow on the corolla (Fig. 50) as 
in most gamopetalous flowers, and in Eschscholtzia (Fig. 49). In the 
Orchis Family the stamens grow on the pistil. 
Irregular Flowers are those in which parts of the same kind are 
unlike in form or size. 
Inflorescence. The forms of flower-clusters are almost as various 
as the shapes of the flowers, but they 
may all be referred to two plans, viz.: 
Terminal and Axillary. The Raceme jaay 
(Fig. 52) is a simple form of axillary 
inflorescence in which the leaves are 
reduced to bracts. If the flowers are 
sessile (without pedicels) the raceme 
becomes a Spike (Fig. 53). If the 
older flowers are raised on long pedi- 
cels the flat-topped cluster is called a 
Corymb (Fig. 55). In an Umbel the 
54 53 52 
pedicels all grow from the end of the 54 ©vme- 58- Spike. 52. Raceme. 
¥ peduncle (Fig. 56). If these are 
very short or obsolete a Head is 
formed. A Panicle is a loose com- 
pound raceme. A Thyrse is a dense 
panicle. Fig. 54 represents a Cyme, 
the type of terminal inflorescence. A 
many-flowered cyme isa Fascicle ; more 
densely flowered, a Glomerule. Cymes 
and Fascicles resemble Corymbs; but 
in the former, the central flowers are 
the older, while in the latter, the younger flowers or buds occupy the 
center. Glomerules differ from heads in the same way. 
The woodland flowers Trillium and Anemone furnish examples of 
the simplest form of Terminal Inflorescence. Their simple stems bear 
each one flower at the top. Often flowers seem to be axillary when the 
plan of inflorescence is terminal. Fig. 57 illustrates a case of this kind. 
56 
56. Umbel. 55. Corymb. 
