FORMS or THE COROLLA. ]95 



pound, as in the Rose, in which it is polypetalous, 

 of severaL The Nectary is somelimes a part cf 

 the petal, sometimes separate from it. 



A monopetalous Corolla consists of two parts ; 

 the tube, tubus^ the cylindrical part inclosed in the 

 calyx of the Primrose ; and the limb, limbus, which 

 is the horizontal spreading portion of the same 

 i^ower, J] 155. The analogous parts of a polype- 

 talous Corolla, as in the Wall-fiower or Stock,y! 166, 

 are named the claw, unguis^ f. 157 a, and tlie bor- 

 der, lamina y b." 



The Corolla is infinitely diversified in form in 

 different genera, whence Tournefort and Rivinus 

 derived their methods of arran2;ement. It is called 

 regular when its general figure is uniform, as in the 

 Rose, the Pink, the Colua)bine, Aguilegia vulgaris, 

 Engl, Bot. t. 297, and Gentiana Fneumonanihe, 

 t, 20 ; irregular when otherwise, as the Violet, 

 /. 619, 620, Dead-nettle, /. 768, and Lathyrus, 

 t, 805 and 1 108. An equal Corolla,y! 156, is not 

 only regular, but all its divisions are of one size, 

 like those of the Primrose, t.5, Campanula, t. 12, 

 or Saiifraga, t. 9 ; an unequal one, J'. 158, is when 

 some segments are alternately smaller than the 

 others, as in Bufomus, t. 651, or otherwise diffe- 

 rent, as in Aquilegia, i. 297. It is by no means al- 

 ways necessary, in defining characters of genera, to 

 use these last terms, it being sufficient in general to 

 say that a Corolla is regular in opposition to one 

 O 2 



