24 RANGE ITSrVESTIGATIONS IN ARIZONA. 



of the inclosure has necessarily been made in the previous parag-raphs. 

 All of the perennial species mentioned above grow here in scattering 

 clumps. Besides those mentioned, of which the gramas {Bouteloua 

 hromoides, B. eriopoda, B. curtqyendida, and B. Mrsuta), Andropogon 

 saccharoides and A. contortus are the most important, Muldenhergm 

 vaseyana, Hllaria cenchroides^ Aristlda dlvergens^ A. schiedeana^ Era- 

 grostiH lagens, ChMocJdoa coviposita, Tmchiii^ogon montufari^ Le]>- 

 tocJdoa duhia, Epicampes Hgeiis^ together with a little Hllaria mutlca 

 in a few places, are of importance. Panicum lachnantlmm. usually 

 grows under the protection of shrubs, as stated above, but it some- 

 times covers considerable areas of open land, as shown in PL II, fig. 2. 

 In 1902 and 1903, Pappopliorum apertmn made a very conspicuous 

 growth upon the top of Pyramid Hill, where it and Nlcotiana trigoiw- 

 phylla were the only conspicuous plants. 



The blue grama {Bouteloua oUgostachya)^ although of great impor- 

 tance on the opposite side of the mountains, does not occur here, at 

 least not in sufficient quantities to be of any consequence. The same 

 is true of CJdoris elegans. 



A part of the forage upon the inclosure is produced by the Eriogo- 

 nums, which are not distantly related botanically to the docks, one of 

 which, the canaigre {Rimiex hymenosepalus), is very common along 

 all of the arroyos. The most important species is Erwgonum micro- 

 thecum., which grows to best advantage on some of the rougher foot- 

 hills of the regions south and west of Proctor. It makes its best 

 development here upon the higher lands beyond the fence line. Many 

 of the annual species are also grazed by stock, and E. tliuy^leri^ E. tri- 

 chojwdium^ E. certimwi, E. ahertiamwi, and E. divaricatum are abun- 

 dant enough to influence the general aspect of portions of the field at 

 certain seasons of the year. Besides the above species, E. polycladon^ 

 E. thomasii, E. pliarnaceoides^ and E. imtsoni C^) are common in some 

 localities. Eriogonum tricliopodium is so abundant at times in the 

 region between the bushy and open foothills and farther north as to 

 give its characteristic yellow color to large areas of ground. 



AMOUNT OF FEED PRODUCED, 



It seems highly desirable to secure as accurate an estimate as pos- 

 sible of the amount of herbaceous feed produced upon this inclosure 

 at the present time. This is desirable not only for an estimate of the 

 amount of stock that can be carried upon these lands, but also as a 

 basis for comparison as to the value of protection and systematic gi'az- 

 ing when observations shall have been made and data secured upon 

 such points. \\\ view of this fact an attempt was made to secure at the 

 most opportune times during the two vegetative seasons as accurate 

 an estimate as possible of the amount of growth which occurred upon 

 the inclosure during the seasons of 1903. The estimate was secured 



