30 „ ANDROPOGONEAE 



2. Schizachyrium scoparium (Michx.) Nash. Fairly 



coniiiinii ill the mountains on I lie drier slopes in pine timber or in 

 guUits and dry water courses in the higher plains, especially in the 

 northern and eastern part of the state. Upper Sonoran and into the 

 Transition Zones. 



3. Schizachyrium Cirrhatum (Mack.). A rather rare grass 

 known in this State only from tht' drier mountains and hills of the 

 southwestern i)art. Sonoran Zones. 



2. AMPHSLOPHIS Nash. 



Hai'.s on the raclii.s and ijetlicels shorter than 



the spikelets. 1. ,4. torightii. 



Hairs on the rachis and pedicels longei- than 

 the spikelets. 

 Awns 10 mm. long or less; panicles smaller 



than in the next. 2. A. savcharoides. 



Awns more than 10 mm. long; panicles larger 



and much liairier than No. 2. 3. .1. Irncnpocion. 



1. AmphilophiS wrightii (Hack.) Nash. Comes into New 

 Mexico from Sonora and Arizona. Known only from the mountains 

 of the southwestern part. Sonoran Zones. 



2. AmphilophiS saccharoides (Sw.) Nash. This is the 



Androjxjijan lorreyamis of various authors. It is a common road- 

 side and ditch hank weed of the Rio Grande and Pecos Valleys 

 and occurs sparingly in the arroyos leading into these valleys. 

 From All)n(|uei(|ue siiuth. Lower Sonoran Zone. 



3. AmphilophiS leilCOpogon (Nees) Nasli. This is the 

 Androjtuijon sacchavuides ,,f various authors, not of Sw. It is 

 associated with tlie preceding species but is much the more common; 

 it also occurs rre(|nently in the mountains up to about (iOOO feet. 

 In the Soiioi'aii Zones. 



3. ANDROPOGON L. Tall Sage Grasses 



Koiiith glunio of the sessile spikelet with a 

 lorg bent awn, more or less twisted at the 



base. 1. A. chriisocomus. 



Fourth glume of the sessile spikelet awnless, or 



with a short, straight, untwisted awn. 2. .1. hallii. 



