56 Order POALES 
12. Stipa. 96. 
Awns less than 5 cm. long; empty scales less than 1 cm. long. 
1. S. viridula. 
Awns adm. or more long; empty scales 2 cm. or more long. 
Flowering scales 8 to 12 mm. long, awn slender, fiexible. 
2. S. comata. 
Flowering scales 20 to 25 mm. long, awn stiff. 3. S. spartea. 
1. Stipa viridula Trin. Feathery Bunch-grass. 
In the western part of the state. Belmont; Burwell; Central City; 
Deuel county; Mullen; Valentine; Weigand. 
2. Stipa comata Trin. & Rupr. Needle-grass, Western Spear-grass. 
Common in the western part of the state and in the sand-hills. 
Axtell; Belmont; Box Butte county; Broken Bow; Brunswick; Har- 
rison, Halsey; Kearney county; Thedford; Valentine. 
3. Stipa spartea Trin. Porcupine-grass, Spear-grass. 
Common in prairies in the eastern part of the state. Crete; Cherry 
county; Lincoln; Thedford; Weeping Water. 
13. Aristida. 93. 
Central awn 3.5 cm. long or more. 
Awns distinct to the base, not articulated to the scale. 
First scale much shorter than the second. 
Second scale 1.5 em. long, but little longer than the flowering 
scale. 4. A. fendleriana. 
Second scale 2 cm. long, much longer than the flowering scale. 
5. A. longiseta. 
First scale as long as the second or nearly so. 6. A. oligantha. 
Awns united at the base and articulated tothe scale. 
8. A. desmantha. 
Central awn not over 3 cm. long. 
Lateral awns much shorter than the central one. 
Spikelets 10-15 mm. long. 2. A. basiramea. 
Spikelets about 6 mm. long. 
Central awn 1 cm. or more long, the lateral 2-6 mm. long. 
7. A. gracilis. 
Central awn 3-6 mm. long, the lateral reduced to erect teeth. 
1. A. dichotoma. 
Lateral awns nearly as long as the central one. 3. A. fasciculata. 
1. Aristida dichotoma Michx. Poverty-grass. 
Nebraska, according to Britton’s Manual. 
2. Aristida basiramea Engelm. Tufted Triple-awn. 
Common in the sand-hill region. Atkinson; Broken Bow; Exeter; 
Long Pine; Thedford; Valentine. 
3. Aristida fasciculata Torr. Dog-town Grass. 
In dry soil mostly in the western part of the state. Lavaca; Lin- 
coln; Long Pine; Thedford. 
4. Aristida fendleriana Steud. 
In dry sandy soil. Crawford; Lavaca; Valentine. 
5. Aristida longiseta Steud. 
In dry sandy soil. Callaway; Long Pine; Wood Lake. 
6. Aristida oligantha Michx. Prairie Triple-awn. 
Common over most of the state. Ainsworth; Endicott; Ewing; 
Franklin; Grand Rapids; Lincoln; Long Pine; Minden. 
