xxvm 



EXPLANATION OF TERMS. 



Wheel-Shaped : when the tube is very short and the border spreads out 

 in a way suggestive of the divergent spol^es of a wheel. (FiG, 39.) 



Campanulate, or Bell-Shaped, when towards the summit the tube 

 gradually expands and the border is inconspicuous. (FiG. 40.) 



Funnel-Form : when a narrow tube spreads graduallv to a wide border. 

 (Fig. 41.) 



Tubular: when the tube is long, narrow and widens but little towards 

 the summit. (FiG. 42.) 



Fu n n el-sh aped. 

 FIG. 41. 



Ligulate : when strap-shaped, as in the dandelion. (FiG. 43.) 



Labiate : when the corolla is so divided as to form two parts, or lips. In 

 such instances usually two petals have united to form the upper lip, while 

 the three other petals have formed the lower lip. These two are then 

 described separately according to their peculiarities. (FiG. 44.) 



Under Polypetalous Corollas we find these named : 



Rosaceous : when the petals are without claws and quite distinct, as in 

 the rose. 



Cruciferous : when there are four petals raised on claws and spread out 

 in the form of a cross. (Fig. 45.) 



