OF THE CORGLLA. 206 



ted, generally more coloured leaves, which are always 

 internal with respect to the calyx, and constitute the 

 chief beauty of a flower. In the Rose the Corolla is 

 red and fragrant ; in the Violet purple ; in the Prim- 

 rose yellow. 



This term includes two parts, the Petal, Petalum^ 

 and the Nectary, Nectarmm, The former is either 

 simple, as in the Primrose, in which case the Corolla 

 is said to be monopetalous, of one petal ; or com- 

 pound, as in the Rose, in which it is pol} petalous, 

 of several. The Nectary is sometimes a part of the 

 petal, sometimes separate from it. 



A monopetalous Corolla consists of two parts ; the 

 tube, tubus, the cylhidrical part enclosed in the calyx 

 of the Primrose, and the limb, limbus, which is the 

 horizontal spreading portion of the same flower, f,. 

 155. The analogous parts of a polypetalous Corol- 

 la, as in the Wall-flower or Stock, yi 156, are named 

 the claw, un^uis^f. 157 a, and the border, lamina^ b. 



The Corolla is infinitely diversified in form in dif- 

 ferent genera^ whence Tournefort and Rivinus deriv- 

 ed their methods of arrangement. It is called regular 

 when its general figure is uniform, as in the Rose, the 

 Pink, the Columbine, Aquilegia^ vulgaris^ Engl. Bot. 

 t. 297, and Gentiana Pneumonanthe, t. 20 ; irregular 

 when otherwise, as the Violet, t. 619, 620, Dead-net- 

 tle, t. 768, and Lathijrus, t. 805 and 1108. An 

 equal Corolla,, /I 156, is not only regular, but all its 

 divisions are of one size, like those of the Primrose, 

 t. 5, Campanula, t, 12, or Saxifraga, t. 9 ; an une- 

 qual one.yi 158, is when some segments are alternate- 



