THE COROLLA. 133 



to petals. If, however, a petal is narrowed into a long and 

 slender portion towards the base, that portion is known 

 as the claw, whilst the broader upper part is 

 called the limb (Fig. 176). The leaf-terms 

 are then applicable to the limb. 



208. Gamopetalous corollas assume various 

 forms, most of which are described by terms 

 Fig. 176. easily understood. The forms assumed 

 depend almost entirely on the shape of the petals 

 which, when united, make up the corolla. If 

 these, taken separately, are linear, and are united 

 to the top, or nearly so, the corolla will be tubular 

 (Fig. 177). If the petals are wedge-shaped, they 

 will, by their union, produce a funnel-shaped 

 corolla (Fig. 178). In the campanulate or bell- 

 shaped form, the enlargement from base to sum- 

 mit is more gradual. If the petals are narrowed Fig. 177. 

 abruptly into long claws, the union of the claws into a 

 tube and the spreading of the limb at 

 right angles to the tube will produce the 

 salver-shaped form, as in Phlox (Fig. 179). 

 The rotate corolla differs from this in 

 having a very short tube. The corolla of 

 the Potato is rotate. 



209. The most important irregular 

 gamopetalous corollas are the ligulate, 

 which has been fully described in the 

 178 * examination of the Dandelion, and the 

 labiate^ of which we found an example in Catnip (Fig. 

 59). The corolla of Turtle-head (Fig. 180) is another 



Fig. 176. Single petal of a Pink. Fig. 177. Tubular corolla of a Honeysuckle. 

 Fig. 178. Funnel-shaped corolla of Calystegia. 



