38 BOTANY. 



An. Irregular calyx, corolla, or perianth, has some of its 

 parts unlike the others in size or form (Figs. 129, 131). 

 The same terms used to describe leaves are applied to 

 the sepals and petals of flowers. Sepals are said to be 

 erect when turned up ; reflexed, when turned down ; con- 

 nivent, when turned inward ; and divergent, when they 

 spread outwafdly. Separate the regular flowers of your 

 collection from those that are irregular. Describe the 

 flower-leaves. 



EXERCISE XVI. 

 Kinds of Corolla. 



Gather as many different kinds of flowers as you can 

 find before you begin with this exercise, that you may 

 have living examples of many kinds of corolla. Of course, 

 as your observation extends, you will, all the while, be 

 finding new forms. 



A petal is made up of parts, as shown in Figs. 124, 

 125. The limb is the thin, broad, upper part of a petal. 

 The claw is the part that is joined to the receptacle. 

 Sometimes it is stem-like. Look over the flowers you 

 have gathered, and put by themselves polypetalous ones, 

 and in another place the gamopetalous ones. Again ex- 

 amine the polypetalous division, and put the regular flow- 

 ers together, leaving the irregular ones till these are 

 looked over. 



Now, there are three kinds of regular polypetalous co- 

 rollas. The first is like Fig. 122. It has four petals grow- 

 ing in the shape of a cross, and so is called a cruciform 



Limb. 



-Claw. 

 -- v^iaw. \i 



FIG. 124. 



