HORDEAE 



173 



Flower clusters few, 15- 25-flowered, gen- 

 erally darker colored. 

 Perianth-segments green bordered, lig- 



ules usually not auricled. 

 Perianth-segments fuscous or very dark 

 brown; ll&ules produced into small 

 auricles. 

 Leaves neither septate nor equitant. 

 Leaves hollow; flowers few, in small heads. 

 Stem leafy only at the base, but the 

 upper leaf often with a long sheath; 

 perianth about 4 mm. long; lower 

 bract of inflorescence membran- 

 ous. 

 Stem more or less leafy; perianth 5 to 

 6 mm. long; lower bracts foliaceous. 

 Leaves not hollow; flowers numerous. 

 Flowers not bracteolate, in true heads on 

 branches of the inflorescence; leaves 

 broad and grass like. 

 Flowers bracteolate, Inserted singly on 

 the branches of the inflorescence; 

 loaves narrowly linear, either flat 

 or subterete and channeled. 

 Annual plants, quite small; stems 



branching. 

 Perennial plants, much larger; stems 

 simple. 

 Auricles cartilaginous, yellowish- 

 brown; bracts usually elongated 

 much exceeding the inflores- 

 cence; perianth spreading. 

 Auricles scarious or membranous 

 scarcely produced; bracts usual- 

 ly much shorter, hardly exceed- 

 ing the inflorescence. 

 Perianth segments about equal- 

 ling the capsule, 3 to 4 mm. 

 long. 

 Perianth segments mostly exceed- 

 ing the capsule, 4 to 5 mm. 

 long. 



7. J. parous. 



8. J. saximontanus. 



9. J. triglumis. 



10. J. castaneus. 



11. J. longistylis. 



12. J. bufoniua. 



13. J. dudleyi. 



14. J. interior. 



15. J. arizonicus. 



A single specimen of Juncus neo-mexicanus Wieg" (determined 

 by Wiegand) was collected by Dr- Palmer probably in extreme west- 

 em New Mexico near Fort Defiance in 1869. It seems too near to 

 J. arizonicus, 



I. Juncus drummondii Mey. Above timber line on the 

 high mountain."^ in the northern part of the State: in the Arctic- 

 alpine Zone. 



2. Juncus balticUS L. In the mountains at middle eleva- 

 tions in wet |)l;i('is and bi'ought to lower levels ocea.JonalIy y 

 stream; in ihe Ti-an>itii)n Zone mostly. 



