28 



COHESION 



of Botany,' 1866, p. 168, tab. 47. In Orchids, this 

 cohesion of sepals is very often co-existent with other 

 more important changes, such as absence of the la- 

 bellum, dislocation of the parts of the flower, &c. 



Cohesion of the petals. Linnaeus mentions the occur- 

 rence of cohesion of the petals in Saponaria} Moquin 

 notices a Rose in which the petals were united 

 into a long tube, their upper portions were free and 

 bent downwards, forming a sort of irregular limb. An 

 instance of the polypetalous regular perianth of 

 Clematis viticella being changed into a monopetalous 



Fio. 11. Gamopetalous flower of Papaver bradeaium. 



irregular one, like the corolla of Labiates, is recorded 

 by Jaeger.^ There is in cultivation a variety of 

 Papaver bracteatum, in which the petals are united by 

 their margins so as to form a large cup. Under 



' Phil. Bot.,' 125. 



' ' Nov. Act. Acad. Nat. Cur.,' 14, p. 642, t. xxxvii. 



