XVIU 



INTRODOCTOKY LESSONS. 



to be Perigynous ; or the stamens ma}' grow on t!ie corolla (Fig. 50) as 

 iu most gamopetalous flowers, and in E-schscIioltzia (Fig. 49). In the 

 Orchis Family the stamens grow on the pistil. 



39. Irregular Flowers are those iu 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 AxilUirij. 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 Uinhd the 

 pedicels all grow from the end of the 



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 is a Fascicle ; more 

 densely flowered, a Glomerule. Cymes 

 5fi 5,-, and Fascicles resemble Corymbs; but 



56. Umbel. 55. Corymb. -^^ j.^^^ former, the central flowers are 



the older, while iu the latter, the younger flowers or buds occupy the 

 center. Glomerules differ from heads iu the same way. 



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



