IQI2] 



CH A MBERLA IN— BOW EN I A 



423 



In the variety the stem is spherical or turnip-shaped, usually 

 about the size of a man's head, and has 5-20 slender branches at 

 the top, like those of the species, only more numerous and reaching 

 to the surface or even a little above (fig. 4) . The slender branches 

 themselves often branch. As a consequence, the foliage display is 

 much greater in the variety than in the species. Usually, the 

 slender branch bears only one leaf at a time, but two or three leaves 

 are sometimes present. Cones are borne only on the slender 

 branches. 



In both species and variety the slender branches arise from 

 buds at the top of the main stem, the buds often being due to 

 injuries. Where the main stem has been torn by the plow, numer- 

 ous buds may start. 



Considering the difference in geographical distribution, the 

 difference in leaflets, and particularly the striking difference in the 

 stems, I have suggested that the variety be elevated to specific 

 rank. I have had the assistance of my colleague, Professor J. M. 

 Greenman, in the preparation of the description. 



University of Chicago 



