ANDRCJPOGOXEAE 31 



1. Antlrcpogon chrysocomus Xush. On dry hillsides or 

 open places in llie niunnlaiiis al (''('Nations of i'rom GOOO to 7500 

 feet in tlic liansition zone. It is never very abundant in any on*» 

 location. 



2. Andropogon hallii Hack. On the plain.s and sand hills of 

 the eastern tier d comities, coming in from farther east. In some 

 places it is not unconnnon and is always conspicuous on account of 

 its size. In the Uppei' Sonoran Zone. 



4. SORGHASTRUM Xa h 



I. Sorghastrum nutans (L.) Nash. Widely distributed in 

 the iii()ui;lains ihioiiolKMit liie State at elevations of from 6000 to 

 7.')()() led aiid on the plain> in the northeast corner; in the Transition 

 Zone. Xe\er \ ery abundant in any place. 



5. SORGHUM Pers. 



I. Sorghum halapense (L.) I'ers. The common JOHXSON 

 Gr.\.ss has been introduced at several ])laces in the irrigated valleys 

 in the southern pait < f the state. ai:d occurs as a weed in fields 



and on ditch l)anl;>. Lower Sonoi-an Zone. 



6. HETEROPOGON Per.. 



I. Heleropogon COntortus (L.) Beauv. Is known only from 



the hot (by inonntaii- n\' the -outhei'u jiart of theStafe. In the 

 Sonoian Zones. 



7. ELIONURUS II. cS: B. 



I. ElionuruS barbiCU'mis Hack. A Mexican species known 

 in New i\Iexico from a single collection from the e.xtreme south- 

 Avestern corner near the l?oundary 'i: (' Lower Sonoran Zone. 



8. TRACHYPOGON Xees. 



1. Tiachypogon plumOSUS dl. and B.) Nees. Another 

 Mexican species krown only Irom the extreme southwestern corner 

 of the State. !n the Lower Sonoran Zone. 



