174 HORDEAE 



3. J uncus mexicanUS Willd. On plains in wet soils in tho 

 southern part of the State at low levels. It will endure dryish and 

 alkaline soils. In the Lower Soiioran Zone. 



4. J uncus torreyi Coville. In bogs and cienagas and flood- 

 ed river valleys of the lower parts of the State up to about 6000 

 feet altitude. In (he Sonoran Zones, 



5. J uncus mertensianus Bong. Known in New Mexico from 

 a single collection at Spirit Lake at an elevation of about 10000 

 feet. Probably fairly common on high peaks hi the northern part 

 of the State; in the Arctic-alpine Zone. 



6. J uncus brunescens Rydb. With the next, about the most 

 common species of the State, found in the timber covered moun- 

 tains at mid'dle elevations (or sometimes lower) beside streams, 

 seeps or in cienagas, in the Transition Zone. 



7. J uncus parous Rydb. Commonly with the preceding 

 having the same a'titudinal and geographic range; often confused 

 with it. 



8. JuncUS saximontanus A. Nels. Rare in our rangej 

 found only in the northern part of the State ; in the Transition Zone. 

 Easily confused with the preceding. 



9. Juncus triglumis L. An Arctic-alpine species known in 

 N'>w Mexico from a single collection on Truchas Peak at an eleva- 

 tio.. of 12500 feet. 



10. Juncus castaneus Smith. Another high mountain form 

 known in New jMexico so far only from Truchas Peak. Arctic- 

 alpine Zone. 



11. Juncus longistylis Torr. Fairly common at middle ele- 

 vations of frinii 7000 to 8500 feet, in the mountains throughout the 

 State; in the Transition Zone. 



12. Juncus bufonius L. A small annual p'ant occurring 

 beside mountain streams in sandy soil: never common or important; 

 Transitiori or Upper Sonoran Zone. 



13. Juncus dudleyi Wiegand. A common species in cool 



cienagas or bogs at elevations of 7000 to 9000 feet; Transition 

 Zone. 



