xxii 



INTRODUCTION. 



imperceptible transition from one into the other. 

 Within the calyx is the corolla^ an assemblage of 

 delicately modified leaves, 

 Y-^^^^^ \k arranged alternately with the 

 m^-^r \. sepals, and usually coloured, 



I a word used by botanists to 

 I denote any hue but green. 

 ^ They are called petals^ and, 

 BRACTS, CALYX, AND as wcU as the sepals, are 

 COROLLA. often united throughout 



their lower portion into a tiibe, the expanded 

 part being then called the limh. The lower part 

 of a single petal is called the claw, the upper the 



COROLLA OF ONE PETAL. COROLLA OF FIVE PETALS. PETALS. 



border. Petals often bear so strong a resem- 

 blance to sepals, that it is almost impossible to 

 .V,; . distinguish one from the other, as 



ffi&P I W in the tulip. Within the corolla, 

 lif I and sometimes cohering with it, is 

 ^ a row or several rows of delicate 

 threadlike organs, called stamens. 

 These are composed of three parts : 

 STA3IENS. filament, or thread-like j)or- 



tion, the same in structure as the petiole of a leaf 



