AGROSTIDEAE 83 



Sheaths almost or fiuite glabrous; leaf- 

 blades not widely spreading; pani- 

 cles 6 inches to more than 1 foot 

 long; plant 2 feet high or more; 

 stouter. 

 Panicle mostly included in the sheath, 

 rarely if at all spreading, lower 

 ijranches longer than the upper: 

 r lowering glumes about equa! to 

 empty glumes, acute or obtuse, 



less than 2 mm. long. 10. S. cryptandrus. 



Flowering glumes much longer than 

 the empty glumes, long acumin- 

 ate 5 to 6 mm. long. 11. S. asper. 

 Panicle mostly exserted, rather wide- 

 ly spreading, sometimes somewhat 

 nodding; lower branches about as 

 long as the upper ones. i2. S. flexuosus. 



1. SporobolUS giganteus Nash. A rather uncomjnon coarse 

 grass of the sand hills in the southern part of the State, in the 

 Lower Sonoran Zone. 



2. SporobolUS Strictus (Scribn.) Merrill. Common in the 

 southern part of the State on the sandy mesas and reaching up 

 into the drier mountains in the LoAver and Upper Sonoran Zones. 



3. SporobolUS COnfUSUS Vasey. Usually occurs beside 

 seeps in the mountains in the Upper Sonoran and Transition Zones. 



4. SporobolUS auriculatUS Vasey. In the very driest situa- 

 tions on the Mesas; rather rare but easily confused with the next 

 which is pretty common. Mostly Lower Sonoran. 



5. SporobolUS asperifoliUS (Nees and Mcy.) Thurb. Fairly 

 common on ditch banks and beside streams, sometimes forming a 

 sod on small areas; mostly in the Upper Sonoran Zone. 



6. SporobolUS texanus Vasey. So' far, known in New 

 Mexico only from the Pecos Valley from Roswell south: in the 

 Lower Sonoran Zone. 



7. SporobolUS airoides Torr. Bunch Grass. Salt 



Grass (of the Pecos Valley region). One of the commonest grasses 

 of the lower levels in the State: in the valleys and on mesas; in the 

 Lower Sonoran Zone. 



8. SporobolUS wrightii Scribn. Sacaton. A much prized 

 coarse perennial, growing beside arroyos and on the mesas where 

 there is sufficient water, in the Lower Sonoran Zone. 



9. SporobolUS nealleyi Vasey. A small and unimportant 



