Desckiftion of Plate. 



A quadrifoliar spur iu longitudinal section. On the left is .seen the 

 base of a normal needle, on the right two needle bases, the outer and 

 lower inserted being normal ; the inner, smaller and higher inserted, 

 being the fourth and abnormal needle of the spur. Centrally is the 

 interfoliar bud with its scale leaves. 



