274 TwENTY-siSviiNTH Annual Report 



complete the work on the flora. It has been the means of bringing 

 to notice a number of species that heretofore were not known to occur 

 in the State. 



In addition to this, the writer practically completed during the 

 year a study of the native Ptcridophytcs or fernworts, Chcnopodiaceae 

 or Goosefoot family which includes the saltbushes, and Amaranthaceae 

 or Tumble-weed family. Studies were also made on the trees of Ari- 

 zona which added several more species for the State, and work was 

 begun on the grasses. Besides the above, two classes were taught each 

 semester. 



Six weeks of the past summer was spent in field work, principally 

 about Prescott, Flagstafl:', and the Grand Canyon. This trip was made 

 by automobile with a camping outfit which made it possible to stop 

 wherever interest demanded. Much valuable information was secured 

 relative to grazing, carrying capacity of ranges, and poison weeds. The 

 distribution and abundance of the more important plants was also noted. 

 Quite complete plant collections were made at the Grand Canyon and 

 Prescott. A careful study was also made of the shade and ornamental 

 plants growing most successfully above altitudes of 5000 feet. The 

 information on cultivated species is being included in a bulletin on the 

 shade and ornamental plants of Arizona. 



MISCELLANEOUS 



The writer read a paper at the meeting of the American National 

 Livestock Association, El Paso, Texas, last January, entitled The 

 Practical Application of the Ferris Stock-raising Homestead Bill to 

 Our Western Grazing Ranges. This was published in the Proceedings 

 of the Nineteenth Annual Convention of the American National Live- 

 stock Association, 1916, pp. 116-120. This law was enacted recently, 

 and the stockman may now take up a section of arid grazing land for 

 a homestead. 



J. J. ThornbEr, 



Botanist. 



