FLOWERS. 41 



It is important to notice whether the calyx is entire or 

 cleft (divided). When the calyx is partly separated, it is 

 called dentate (toothed). When separated half way down, 

 it is cleft ; and when all the way down, it is termed 

 partite. 



The corolla is the second or inner floral envelope. It 

 is composed of those coloured leaves which generally form 

 the most attractive portion of the flower, being very seldom 

 green. It has one or more pieces called petals, and is 

 either monopetalons {one petal) or polypetalous {many petals). 

 In Plate IV. the corolla (co) is entire for the greater portion 

 of its length, in the shape of a tube, having four short petals 

 at the end. This is termed a tubular corolla. In Plate V. 

 the corolla (co) is very distinctly divided into separate 

 parts, as will be found on examining the figure. Petals 

 are of different shapes and sizes. The principal distinc- 

 tions are : — 



1. Papilionaceous corolla, meaning ' like a butterfly,' so 

 named from the resemblance of the petals to the wings 

 of that insect. The flower of the pea is a good example. 



2. Cruciform corolla. — Four petals arranged in the shape 

 of a cross. The cabbage and wallflower are of this kind. 



3. Rosaceous corolla. — Having five similarly shaped 

 petals, spread open like a rose ; as the apple and quince 

 blossoms, rock-rose (Cistus). 



Corollas, like leaves, are of all sizes, from the tiny chick- 

 weed to the giant Victoria Regia and the extraordinary 

 Rafflesia Arnoldi. (See Glossary, heading * Rafflesia.') 



In the gamopetalous or 7?wnopetalous corolla, the leaves 

 cohere more or less, so as to form a corolla of a single piece. 



In a gamosepalous or monosepalous flower, the parts of the 



