256 FORMS OF THE COROLLA, 



enclosed in the calyx of the Primrose ; and 

 the limb, limhus, which is the horizontal 

 spreading portion of the same flower. The 

 analogous parts of a polypetalous Corolla, 

 as in the Wall-flower or Stock, are named 

 the claw* unguis, and the border, lamina. 



The Corolla is infinitely diversified in 

 form in different genera, whence Tourne- 

 fort and Rivinus derived their methods of 

 arrangement. It is called regular when 

 its general figure is uniform, as in the Rose, 

 the Pink, the Columbine, Aquilegia vul- 

 garis, Engl. Bot. t. 297, and Gentian a 

 Pneiwwnanthe, t. 20 ; irregular when 

 otherwise, as the Violet, t. 619, 620, 

 Dead-nettle, t. ?6S, and Laihyrus, t. 805 

 and 1108. An equal Corolla is not only 

 regular, but all its divisions are of one 

 size, like those of the Primrose, t. 5, Cam- 

 panula, t. 12, or Sazifraga, t. 9 ; an un- 

 equal one is when some segments are alter- 

 nately smaller than the others, as in Bu- 

 tojnns, t. 651, or otherwise different, as in 

 Aquilegia, t. 297* It is by no means al- 

 ways necessary, in defining characters of 

 genera, to use these last terms, it being 



