ILLUSTRATION 



I'affe. 



Plate XXII. Fig. 1((. — Plantain {Pl<nil<i(/<i fasligiata MorriH). A valnal)le 

 annual forage plant in w)nthern Arizona. Pliotograi)hed by 

 I). Griffiths. Fig. \h. — Blue grama {Bouleloiia oUgostddnju) as 

 it grows in Arizona. Photographed by D. Gritfiths. Fig. 2. — 

 Range improvement experiment, Tucson, Ariz., showing the 

 condition of the pasture and the method of disk harrowing. 

 Photographed by D. Griffiths 50 



XXIII. Fig. 1. — A "wash" near Tucson, Ariz. The result of l)ut nine 

 years' erosion. Photographed by D. Griffiths. Fig. 2. — The 

 side of the same "wash," showing the depth. Photographed 

 by D. Griftiths ---. 52 



XX I Y. The upper plant six-weeks grama (Bouteloua aristidoidcs) . The 

 lower a dropseed {Sporoholus cryptandrus xtr ictus), both native 

 Arizona grasses of considerable importance. Photographed 



by I). Griffiths 54 



XXV. Fig. 1. — Wright's saccaton {Sporobolus tvrightii) . In the Santa 

 Cruz Valley, Arizona, showing bunches which have not been 

 grazed. Photographed by T>. Griffiths. Fig. 2. — Wright's 

 saccaton, showing its appearance after being grazed. Same 

 locality. Photographed by D. Griffiths 56 



XXVI. Fig. 1. — Shad scale {Atripde.r c(inesrens). Plant protected from 

 grazing, near Tucson, Ariz. Photographed by D. Griffiths. 

 Fig. 2. — Shad scale {Atriplex canescens). Plants in the same 

 locality nearly destroyed by overstocking. Photographed b>- 



D.Griffiths/. 58 



XXVn. Fig. 1. — Seaside blue grass {Poa iiKicnndlta). From a photo- 

 graph taken near Morrison, Oreg., by A. B. Leckenby, 1889. 

 Fig. 2. — OoUet^ting seed of seaside blue grass near Morrison, 



Oreg. From a photograph by A. B. Lec^kenby, 1889 60 



XXVIII. Fig. 1. — Sand dune on the Pacific coast, fiand rye grass {Ely inus 

 arenarius) covering the top of the dune and big head sedge 

 in the foreground. Fig. 2. — »Sand dune held by seaside blue 

 grass {Poa marrantha), near Seaside, Oreg. From a photo- 

 graph by F. Lamson-Scribner 62 



