COROLLA. 



175 



lips are closed, as in Snap-dragon and other species of 

 Antirrhinum, the Corolla is termed personate. In these 

 cases the upper lip is usually concave or vaulted, the 

 other being larger and frequently cleft, but when this 

 arrangement is reversed as in Figwort, the corolla is 

 said to be resupinate. 



A polypetalous corolla is 



Cruciform, when composed of four petals which are 

 arranged in the form of a cross, as in Cabbage and 

 Wall-flower. 



Liliaceous, Fig. 77 when it is composed' of six petals, 

 usually naked, and so arranged as to appear bell- 

 shaped. 



Rosaceous, when it consists of five petals which are 

 (usually) inserted into the Calyx, without the interven- 

 tion of claws, as in the Apple and Rose. 



Papilionaceous, Fig. 79, when it consists of four pe- 

 tals, irregular and assuming the shape of a butterfly. 

 The Pea furnishes an example, and the large petal 

 which encloses the others is the Standard, the two lat- 

 eral petals are the Wings, and the other which is inte- 

 rior and appearing in some instances like the keel of a 

 boat, is denominated the Keel. 



The florets of a compound flower are Tubular as in 

 Cacalia, Fig. 73, and Ligidate or strap shaped as in 

 Dandelion. They not unfrequently both occur in the 

 same flower, as in the Alters. 



The petals are usually deciduous and fall with the 

 other parts of the flower, sometimes they remain in a 

 withered condition, as in the Orchis and Cucumber, 

 sometimes they continue fresh and are termed persis- 

 tent, and sometimes they are caducous dropping as soon 

 as the flower expands. 



" The whole use and physiology of the Corolla have 



