Table 2. --The extent of 'pinyon-^uniipep woodlands within the Great Basin^ by State 



: : : Percent 



State : Acres : Hectares : of total 



Nevada 



11,674,600 



4,726,500 



66.2 



Utah 



4,123,200 



1,669,300 



23.4 



California 



1,364,400 



552,400 



7.7 



Arizona 



298,300 



120,800 



1.7 



Idaho 



137,100 



70,100 



1.0 



Total 17,633,600 7,139,100 100.0 



Floristics 



To help others initiate studies in pinyon- juniper woodlands, we have listed the 

 240 positively identified species of vascular plants which were found in our sample of 

 Great Basin pinyon- juniper woodlands (table 3). An additional 127 specimens, nearly 

 all annual forbs, could not be positively identified to the generic level because 

 season of collection precluded obtaining specimens with the necessary taxonomic char- 

 acters. This accounts for the 367 total number of species used in prior discussions 

 (West and others 1978) . The number of different species in a plot can be related to 

 probability of sampling, size and height of mountain range, distance from adjacent 

 mountains, and paleo-ecological influences, as well as present environmental variables 

 (West and others 1978). The outstanding feature of the floristics of the pinyon- 

 juniper woodland is the few species it has, considering the large area involved. 



Uf the positively identified taxa, a total of 5 were trees, 67 were shrubs and 

 succulents, 46 were grasses, and 122 were forbs. Four percent of the total list were 

 exotic (introduced); the remainder are native. None of the species identified were 

 listed in the recent compilation of rare and endangered plant species (U.S. Congress 

 1976). All of the species are known to occur outside of pinyon- juniper woodland con- 

 texts. 



Our sampling approach was designed to stress the most common conditions and 

 perennial components of the woodlands of each mountain range. Larger numbers of 

 samples, searches for atypical sites, and sampling earlier in the season would have 

 resulted in the collection of more and rarer species and allowed identifiable vouchers 

 of annuals to be obtained. 



9 



