VARIETIES OF COROLLAS. 



75 



The following are the principal forms of 



REGULAR POLYPETALOUS COROLLAS. 



Cruciform (from the Latin, crux, a cross), 

 when it is composed of four petals with an 

 elongated claw, arranged in the form of a 

 cross, as in cresses (fig. 92). , 



(The four petals have the form of a St. Andrew's 

 cross ; the lower part is the unguis or claw, and the 

 upper part is called the tolamen or border, each petal 

 having the form of a battledore. The claw is some- 

 Fig. 92. CRUCIFORM, what longer than the border.) 



Rosa'ceous, when the petals, from 

 three to five, or more, have a very short 

 claw, and are expanded as in the simple 

 rose (fig. 93). 



Cary'ophylla'ceous (from the Latin, 

 caryophyllus, the garden pink) when 

 the petals, five in number, have very 

 long claws, concealed by the calyx, 

 as in the pink. 



The following are the principal forms of the 



IRREGULAR POLYPETALOUS COROLLAS. 



Papiliona'ceous (from the Latin, papilio, 

 a butterfly), when the petals, five in num- 

 ber, have each a peculiar form, the two 

 lower ones ordinarily united to 

 each other, forming what is call- 

 ed the carina or keel (fig. 95) ; 

 the two lateral ones are general ly 

 expanded and called wings ; and 

 the superior one ordinarily erect, 

 various in form, and covered by 

 the other four, previous to the 



Fig. 95. 



CARINA. 



Explanation of Fig. 94. Represents a papiliona'ceous flower; c, the 

 calyx ; 6, the banner ; c, the wings ; d, the carina or keel ; e, the 

 stamens. 



Fig. 95 is the same flower, having the banner and wings removed to 

 show the carina. 



is it anomalous ? What is a cruciform corolla ? What is a rosaceous 

 corolla ? When is it caryophylla'ceous ? 

 33. What is a papiliona'ceous flower ? What is the vexillum ? 



