THE AMERICAN BOTANIST 49 



crn base of the sand hills cast of town until it sinks away in 

 ihc loose deposits. Sprini,^ Creek and Midland Creek are 

 fartliiT to the noitiiwest. the fish hatchery is near the month 

 ot the former. Alt. rutnam some fifteen miles northeast is 

 a point of interest mncii fre(|uented. The hills west of town 

 have a rich and varied flora due to their okler, richer soil and 

 their protection from the drying chilling southwest wind 

 which sweeps the intcr-mountain country so constantly. The 

 sand hills east oi town exhibit nicUiy patches of desert vege- 

 tation characterized by some species not recorded from any 

 other point so fru- north but nowhere upon them are there 

 any great number of species. The native flora along the 

 river has been almost obliterated especially within the city 

 limits. Necessary embankments have destroyed much of it, 

 other places, subject to yearly overflcnv, have filled up with 

 a great variety of introduced weeds which are rapidly spread- 

 ing and crowding out the native plants even in those areas 

 which have not been disturbed. 



Pocatello has an altitude of 4,500 feet while Kimport 

 Peak is approximately 7,000 feet above sea level. The flora 

 of the valley as a whole is Transitional. Patches of pure 

 Sonoran (ui)i)er) vegetation occur on the sand hills. The 

 Canadian zone appears tcnvard the summits of the higher 

 hills and extends well down in places along the creeks and 

 in the deeper moister gulches. The flora of this part of 

 Idaho is closely related to that of the Wahsatch region, 

 many of the desert species probably having been carried here 

 in the manner above indicated, while the great Snake River 

 valley has always acted as a barrier to the mignation of 

 plants from the north. 



The rapidity with which introduced weeds are crowxl- 

 ing out the native flora is worthy of note. Bromiis tcctorum 



