CERTAIN DESERT PLANTS AS EMERGENCY STOCK FEED. 



11 



sure requirements, and the distribution of none of the species is uniform 

 at any place. The map is as accurate as could be made from the data 

 available and does not pretend to do more than indicate the general 

 region where certain species may be expected to occur. 



Fig. 1.— Diagrammatic outline map of the region where the emergency feeds considered in this bulletin 

 are to be found: 1, Area where bear-grass ( Yucca glauca) formerly was more or less abundant, but where 

 the supply has been reduced by farming operations or where the growth is scattering; 2, area where 

 bear-grass is now sufficiently abundant to render it important as feed; 3, distribution area throughout 

 which soap weed ( Yucca elata) occurs on sandy land but is not uniformly abundant; 4, distribution area 

 of Yucca rupicola and its allies (other species of yucca, sotol, and sacahuista are also found) ; 5, area where 

 lechuguilla (Agave lechuguilla) is most abundant (Spanish bayonet, sacahuista, and sotol are also found); 

 6, distribution area of sotol (Dasylirion spp.) and various daggers ( Yucca baccata and Y. macrocarpa), 

 as well as species of Nolina. 



Soap weed (Yucca elata) and the bear-grass (Yucca glauca) of 

 extreme eastern New Mexico and the Panhandle of Texas are prac- 

 tically always found on nearly level, sandy land. Occasionally they 

 may occur sparingly upon tight soils or in a gravelly arroyo, but this 

 is the exception. Sacahuista and the bear-grass (species of Nolina) 



