CHAPTEK IX. 



THE COROLLA. 



Petals Their texture, insertion, adhesions and cohesions, &c. 

 Actinomorphy, Zygomorphy Types of Corolla Cruciate 

 Rosaceous Papilionaceous Bilabiate Tubular, Funnel- 

 shaped, Urceolate, Rotate and Bell-shaped Corolla Ligule and 

 Corona Hypo-, Peri- and Epigynous Corolla Petaloid Calyx, 

 Perianth, &c. Different Corollas on the same Inflorescence. 



The Corolla is the name given to the totality of the 

 petals, and, as Vi^e have seen, this is true whether the 

 petals are free and separately inserted, or whether they 

 become united into one whole a gainopetalous corolla 

 during their development. 



Excepting that petals are very rarely green, and are 

 usually much more delicate than sepals in texture, colour- 

 ing, and markings of various kinds, what has been said 

 of the calyx applies equally to the corolla and petals as 

 regards insertion, cohesions and adhesions, actinomorphy 

 and zygomorphy, &c. ; and the shapes, surface, margin, 

 apex, &c., of petals, like those of sepals, are described in 

 terms of simple leaves, as set forth in Volume ii. pp. 

 22 and 23. 



Certain types of corolla are so characteristic, however, 

 and recur so often, that special names are applied to them 

 to save lengthy description. For instance, the Cruciate 

 corolla of the Wallflower, where we have four petals all 



