COHESION AND SUPPEESSION. 239 



larity in the placing of these flowers on the stem, or in 

 other words variations in phyllotaxy. The flowers 

 and their bracts were not uniformly distributed on the 

 stem, but certain flowers were very close together and 

 others long distances apart." This variation in the 

 phyllotaxy, showing that a flower here and there has 

 been displaced from its usual position and approxi- 

 mated to or fused with another flower, is the only 

 evidence present that the polymery of these flowers is 



Pig. 145. — Pedicularis sylvatica (Eed-rattle). Diagram of dual flower 

 due to concrescence of two flowers. 66, bracts; S, product of fusion 

 of two sepals each from a different flower ; s, independent sepal ; 

 p', p", p"'> petals of lower lips ; PP, petals of upper lips ; Q, petal 

 of doubtful origin; a,stamens: j, ovaries; d, disks. (After Wigand.) 



due to synanthy and not to fission, as without such 

 evidence it well might be. 



Wigand made an interesting observation in the 

 red-rattle (Pedicularis syloatica) : in one plant the 

 two uppermost flowers of the inflorescence were con- 

 crescent to form a terminal peloric flower : a rare case 

 (PL LI, fig. 6, and figs. 145 and 146 in text). 



Fusion between two of the numerous crowded 

 flowers in the verticillaster of Labiatas has been noted : 

 a by no means surprising occurrence. 



Costerus and Smith describe a case of fusion of the 



