KOOT SYSTEMS OF MIXED-PRAIRIE SPECIES. 



59 



Artemisia canadensis. — This sage is a widely distributed subdoininant and 

 frequently forms socies in the sandhills vegetation. Of the several plants 

 examined, the strong, brown, woody tap-roots varied from 6 to 11 mm. in 

 diameter. They tapered so rapidly that at a depth of a foot they did not 

 exceed 1.5 mm. in thickness. Beginning just below the surface, and in the 



Fig. 23. — Well-developed root system of Artemisia canadensis. 



