A(ikr)STIDEAE 61 



23. STIPA I.. P(jkCLi'ixE Grass. 



Empty iiliiines of the spikelet i:0 iimi. long ur 

 more, awns long. 

 Awns plumose or feathery. 1. S. ufuiiirxicana. 



Awns not plumose. :.'. S. roinota. 



Empty glumes of the si)ikelet less than l.o mm. 

 long. 

 Panicle loose and open. 



Flowering glumes small, 4 nun. Itng oi- less. 

 Awn long, 2 to 3 inches, curled above the 

 bend; flowering glume about 3 mm. 

 long. •'•■ 'S'. tenuissima. 



Awn short, about half an inch long, not 

 curled; flowering glume about 4 mm. 

 long. 4. '^'. fiinbriata. 



Flowering glumes larger, b-mm. long. 

 Empty glumes narrow; awns about two 



inches long, somewhat curved. ">. i<. editorum. 



Empty g.umes broad; awns an inch long 



or less. •;. ^'- pri"fi <-•• 



Panicle nariow and dene, spike-like. 



Leaf blades narrow, n.aigin rolled in; i)lants 

 slender; spikelets lather few. 

 Flowering glumes 4 to 5 mm. long. 7. S. mhior. 



Flowering glumes 8 to 10 mm. long. S. S. scribneri. 



Leaf blades bi-oad, not inrolled; plants 

 stout; spikelets numerous and crowded 

 in large panicles. 

 Plants tall, 3 feet oi- more; spikes 8 inches 



to a foot long. 9. S. vuseyi. 



I'lants lower, about 2 feet high; spikes 



about 6 inches long. 10. S. viridula. 



1. Stipa neo-mexicana Crimil). ) Sci;!ri. On sandy mesas 

 and to some extern in ilic iiioiiniiiiiis almost i.I! ovei- the State; 

 iio'^c.' anyv lu-i'e abuiidaiii : :ii ihe r{)j)(_';- Sonoran Zone. 



2. Stipa COmata Trin. and Kupr. In similai- locations to 

 the preceding ranging a little higher and more abundant in the 

 northeastern part of the State; in the Upper Sonoran and Transition 

 Zones. 



3. Stipa tenuissima Tiiu. A rare grass found at lower 

 levels in the southern part of the State in the Sonoran Zones. 



4. Stipa fimbriata ir. B. K. in the mountains of the 

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

 PiNON Grass in the Guadalupe Mountain region, because it fre- 

 quently gi'ows under the pinon trees. 



