108 
THE FIRST BOOK OF BOTANY. 
get. First of all, observe the parts of petals. They 
are pointed out and named in Figs. 169 and 170. 
Limb.— The npper, and usually the broadest and 
thinnest, part of a petal. 
Claw. —The lower part of a petal, by which it is 
joined to the receptacle. 
The kinds of regular polypetalous corollas are 
shown and named in the following pictures: 
Fig. 171. 
Cruciferous. 
Fig. 172. 
Caryophyllaceous. 
A Crucif'erous Corolla has four petals growing 
in the shape of a cross, Fig. 171. 
A Caryophylla'ceous Corolla has five petals, 
Fig. 173. Fig. 174. 
Rosaceous. 
Liliaceous. 
