^4 AGROSTIDEAE 



grass found only on soils containing large quantities of gypsum in 

 the southern part of the State in the Lower Sonoran Zone. 



10. Sporobolus cryptandrus (Torr.) a. Gray, a common 

 grass throughout the State in dry soils, mostly in the Upper 

 Sonoran Zone, though extending into the lower Sonoran. 



11. Sporobolus asper Michx. and Knuth. Collected once 

 in the mountains of the northern part of the State in the Upper 

 Sonoran Zone. 



12. Sporobolus fleXUOSUS (Thurb.) Rydb. Usually on sandy 

 soils ni the southern part of the State, mostly in the Lower Sonoran 

 Zone. 



Folypogon monspeliensis, sometimes called Beard 

 Grass, superficially resembles a Foxtail or Squirrel-tail 

 grass because of the compact panicle with numerous long 

 awned spikelets. It is of no economic importance and occurs 

 usually in wet alkaline spots at the lower levels. It is nearly 

 always to be found beside any permanent water hole, boggy 

 place or spring where the ground is trampled by the animals 

 that come to drink. 



Blepharonenron trkholcpis is a fairly common peren- 

 nial grass growing in tufts among the rocks and on dry 

 hillsides in the mountains at elevations of from 6000 to 

 8000 feet. It is a very persistent, long lived perennial and 

 forms considerable of the forage in such localities though it 

 never appears as anything but scattered bunches. 



Epicampes rigens is a grass which superficially re- 

 sembles Sporobolus giganteiis and grows in similar situations, 

 i. e. on the sand dunes of the lower plains. It is nowhere 

 very common and consequently of little economic importance. 



RED TOP and its relatives of the genus Agrostis occur 

 rather sparingly in the mountains at rather high levels. Rf:i>- 

 TOP (Agrostis alba) has been introduced in many places 

 with grass seed for meadows and sod grass and in the cooler 

 timbered regions has freelv escaned and p^tahliQlnPrl I'fcplf r^n 



