First Report on the Flora of Wyoming. 6 1 



when any is present, is the common sage brush {^Arte- 

 misia tridentata). The characteristic undershrub is some 

 form of Bigelovia, indiscriminately called White Sage, 

 Rabbit Brush, Golden Rod, etc. Plains of this character 

 may also be denominated grassy plains. The grasses on 

 these of course vary greatly as to the species and the lux- 

 uriance of their growth. The following are among those 

 of most frequent occurrence: Agropyriim glaucum., A. 

 'violacenm, Boiiteloua oligostachya, and B. racemosa, Buch- 

 loa dactyloides, Koeleria cristata, one or two Festncas 

 and several Poas. Along water courses and in boggy 

 places, as well as in over-irrigated places, these are 

 replaced or become mixed with many species of Juncns, 

 Scirpiis and Carex. Sometimes Foxtail {Hordeiun juba- 

 tum) takes complete possession. 



The second class. — The plains strongly impregnated 

 with alkali (sodium carbonate or sodium sulphate), are in 

 some instances nearly devoid of vegetation, but more 

 usually we find several characteristic plants. If the 

 alkali be sodium sulphate the characteristic shrub is Sar- 

 cobatiis veriiiic2ilatns, the well-known Grease Wood. On 

 sodium carbonate soil, this, if not replaced by, has 

 mingled with it some form of Atrip/ex, usually A. confer- 

 tifolia, frequently called White Sage. Other species of 

 A triplex, mostly annuals, are found in this character of 

 soil, and if the soil is very strongly impregnated, as on 

 the shores of salt-marshes and partially dried up alkali 

 lakes, the various species of A triplex, of Siieda and of 

 Salicornea are often the only vegetation. In real alkali 

 bogs we find Distichlis maritima, Triglochin maritima 

 and T. pahistre as the most characteristic vegetation. 



The other areas may be spoken of as the foot-hills 

 and the mountains. 



