1892.] 



NATURAL SCIENCES OF PHILADELPHIA. 



385 



tliose on the shorter branches of the panicle are discoid, as are the 

 lateral ones on the branchlets. 



The explanation seems to involve the question of rhythmic growth. 

 Rest had been nearly reached at the point represented by the 



apex of the cone, when the new flow of growth resulted in the 

 terminal corymb. 



To form the centripetal character of the inflorescence the axillary 

 buds remain at rest until the branch has reached its final length, 

 26 



