30 Order POALES 
Spikelets flat, in loose spikes at the ends of the rays of um- 
bels. 4. C. schweinitzii. 
Spikelets terete, or compressed, in capitate clusters on the 
rays. 
Seales pale green; achene % as long as scale. 
11. C. filiculmis. 
Seales brown, shining; achene as long as scale. 
12. C. houghtonii. 
1. Cyperus diandrus Torr. Cypress-grass. 
Common along streams over most of the state, especially on sand- 
bars. Callaway; Franklin; Kennedy; Long Pine; St. Paul; Valentine. 
2. Cyperus rivularis Kunth. 
Common in wet soil throughout the state. Minden; Nebraska City; 
Pishelville; Richardson county; Thedford; Valentine. 
3. Cyperus inflexus Muhl. 
Cyperus aristatus Rottb. 
Occurs over the whole state, but most abundant in the sand-hills. 
Callaway; Franklin; Lincoln; Minden; Mullen; Pine Ridge; Red 
Cloud; Thedford; Valentine. 
4. Cyperus schweinitzii Torr. 
Common in dry sandy soil. Arapahoe; Broken Bow; Ewing; Frank- 
lin; Foster; Louisville; Minden; Plummer Ford; Red Cloud; Thed- 
ford; Valentine. 
5. Cyperus acuminatus Torr. & Hook. 
Common in moist soil over most of the state. Edgar; Ewing; 
Franklin; Lincoln; Loup City; Minden; Valentine. 
6. Cyperus engelmanni Steud. 
Rare in wet soil. Kennedy. 
7. Cyperus esculentus L. Nut-grass. 
Common in moist soil over most of the state; Callaway; Ewing; 
Kennedy; Lincoln; Wood Lake; Grand Rapids. 
8. Cyperus erythrorhizos Muhl. 
In wet soil in the eastern part of the state. Ewing; Lincoln; Nio- 
brara River; Norfolk. 
9. Cyperus speciosus Vahl. 
Cyperus ferax Rich. 
In marshes in the southeastern part of the state. Crete; Columbus; 
Hardy; Kennedy; Lincoln; Republican Valley; Red Cloud; Valentine. 
10. Cyperus strigosus L. 
Over most of the state, common along streams in the sand-hills. 
Cody’s Lakes; Columbus; Ewing; Minden; Nebraska City; Niobrara 
River; Republican; Thedford. 
11. Cyperus filiculmis Vahl. . 
Fairly common in the eastern part of the state. Columbus; Ewing; 
Hardy; Lincoln; Louisville; Minden; Nebraska City; Red Cloud; Re- 
publican City. 
12. Cyperus houghtonii Torr. 
Natick. 
