XV111 



INTRODUCTOKY 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. 



39. Irregular Flowers are those in which parts of the same kind are 

 unlike in form or size. 



40. 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 

 (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 

 pedicels all grow from the end of the 



54. Cyme. 53. Spike. 52. Raceme. 



peduncle (Fig. 5G). If these are 

 very short or obsolete a Head is 

 formed. A Panicle is a loose com- 

 pound raceme. A Tliyr&e is a dense 

 panicle. Fig. 54 represents a Cyme, 

 the type of terminal inflorescence. A 

 many-flowered cyme is a 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. 



NOTE. It is believed (hit the p- eceding lessons, together with the glossary on page 123, will enable 

 tho learner to understand tho descriptioua m the Flora. Those who wish to pursue the t-tudy of struc- 

 tural botany farther, are advised to get Gray's Lessons; or, better still, Gray's Botanical, Text-book. 



CG. Umbel. 55 



