8 



BULLETIN 1031, U. S. DEPARTMENT OF AGRICULTURE. 



The vegetation is more or less grouped into types. Figure 1 shows 

 the vegetation classified into these range types for the plains of the 

 reserve. Table 1 gives the acreage of each type by pastures of the 

 reserve. 



Table 1. — Acreage ty types and pastures of the plains area of the Jornada Range 



Reserve.'^ 



Pasture. 



Grama- 

 grass. 



Snake- 

 weed. 



Mesquite 

 sandhill. 



Sage- 

 brush. 



Weed. 



Swag. 



Mixed 

 grass. 



Black- 

 brush — 

 creosote 



bush. 



Total. 



1 



Acres. 



3,416 



14,473 



541 



1,497 



533 



315 



Acres. 



1,438 



4,834 



963 



Acres. 



31, 730 



5,922 



486 



74 



Acres. 



8 



423 



50 



Acres. 



894 



721 



82 



461 



Acres. 



5,393 



1,658 



168 



286 



Acres. 

 2 5,472 



2 6,514 



2 120 



2 497 



3 408 



3 1,255 



3 401 



3 253 



3 52 



3 2, 401 



Acres. 

 26,363 



Acres. 

 74, 714 

 34,545 

 2 410 



2 



3 



5 





7 





2,815 

 1,450 

 4,030 



784 

 4 805 



8 







509 



2,427 



245 



9 











33 

 138 



10 











11 



4,292 



746 



1,538 



260 









12 









68 

 398 



6,183 

 12,619 



7 049 



13- 









45 



17,001 









Total 



27,351 



7,495 



38,212 



481 



2,203 



8,142 



17 373 



48,346 



149,603 









1 Pastiire No. 11 is not included. This is an area of approximately 52,317 acres of mixed grasses and 

 browse types in the San Andres Mountains. 



2 Mixed-grass type in this pasture maialy grama, three-awn, and drop-seed grasses. 

 « Mixed-grass type in this pasture maialy burro, tobosa, and salt grasses. 



Because of the time of the year during which the forage in the 

 various types is palatable to cattle and the growth habits of the 

 main forage species, the several types are divided into yearlong or 

 winter range, and summer range. The grama-grass type, mixed 

 grama, three-awn, and dropseed-grass type, snakeweed type, and 

 mesquite-sandhill type constitute the yearlong or winter range, and 

 the swag type, mixed tobosa, burro, and salt-grass type, and black- 

 brush-creosote bush type make up the summer range. 



YEARLONG OE WINTEE-KANGE TYPES. 



The grama-grass type (PL I, fig. 1) is the most important of the 

 several yearlong or winter-range types. Black grama grass is the 

 predominating plant species in this type, but other grasses, such as 

 three-awn and dropseed occur to some extent. Soapweed ^ is the most 

 conspicuous species next to the grama grass and is nearly always 

 found in this type. Occasionally three-awn and dropseed grasses are 

 more abundant than the grama grass, and in such cases form a mixed- 

 Footnote continued from page 5 : 

 Annual weeds — 



Boeihaavia^fioer/taat'ia torreyana. 

 Mouse ea.r= Tidestromia lanuginosa. 

 'ETiogon\iva=EHogonum. spp. 

 Glandleaf =Pecfi8 angustifolia. 

 Caltrops=THJ}ulus terrestris. 

 Slx-weets grasses — 



Aristida ironwides, Bouteloua aristidoides, B. harbata, B. parryi. 

 * Soapweed^ Yucca data. 



