HORDEAE 153 



3. Agropyron arizonicum S. and S. In the mountains of 

 the southern part of the Stale in the Transition Zone. 



4. Agropyron spicatum (Pursh) Rydb. In the mountains 

 of the southern part of the State: in the Upper Sonoran Zone. 



5. Agropyron violaceum (Hor.) Vasey. From the high 

 mountain peaks throuti'hout tlie State in tlie Iludsonian and Arctic- 

 alpine Zones. 



6. Agropyron richardsonii (Trln.) Schrad. in the moun- 

 tains of tlie northern part of tlio St.ite: in the Canadian Zone; rare. 



7. Agropyron caninum (L.) Beauv. Known in New Mex- 

 ico from a sinulc colleetion on Truehas Peak. 



8. Agropyron tenerum Vasey. As here used this name in- 

 cludes the common wheat grass of the timbered areas in our moun- 

 tains. We are unable to separate ^. pseudo.repens s. and S. from 

 this. The species occurs in the Tran.sition and Canadian Zones. 



9. Agropyron smithii. Colorado Blue-stem. This is 

 one of the commonest grasses of the Transition Zone thoiigbout 

 the State, reaching doAviiward into the Upper Sonoran. 



10. Agropyrcn pa'meri (S. anl S. ; Kydb.. Cl..sely re- 

 sembling the last and having inuoh the same distribution. 



69. HORDEUM L. Barley. 



Plants not glaucous. 



Empty glumes (including tlie awns) 1 to 2 



inches long: spikes bright yellowish green. 1. //. jubatiim. 

 Empty ghinies (including the awns) less than 

 3-4 of an inch long; spikes dull reddish or 



brownish gieen. :;. U. nodosum. 



Plants glaucous throughout; introduced weed. 3. //. murinum. 



1. Hordeum jubatum L. Squirrel-tail Grass. Some- 

 times incorrectly called Fox-tail. Common in wet soil in the moun- 

 tains in the Transition Zone and frequently carried lower along 

 irrigating ditches and streams. 



2. Hordeum nodosum L. in high mountaui meadows in 

 wet S( il : in the Canadian and Iludsonian Zones. 



3. Hordeum murinum L. A species probably recently 

 introduced in the eultivaled fie'ds of the southern part of the State. 



