40 POALES 



Blades stiff, erect. tO, P. huachucae. 



Blades lax, spreading. 



11. P. huachucea vr. silvicola. 

 Autumnal form branching from the middle nodes, form- 

 ing widely spreading mate. (See also No. 11.) 



12. P. tennesseense. 

 Culms conspicuously pilose with long horizontally spread- 

 ing hairs. 13. P. praecocius. 

 Ligule obsolete or nearly so. 17. P. latifolium. 

 Spikelets turgid, blunt, strongly nerved. 



Spikelets not over 3 mm_. long. 14. P. wilcoxianum. 



Spikelets over 3 mm. long. 

 Panicle about as wide as long, spikelets less than 3.5 mm. 

 long, first empty scale % as long as the spikelet. 



15. P. scribnerianum. 

 Panicle narrow, spikelets over 3.5 mm. long, first empty 

 scale ^2 as long as spikelet. 16. P. leibergii. 



(Key abridged from "North American Species of Panicum," by Hitch- 

 cock and Chase.) 



1. Panicum dichotomiflorum Michx. 

 Panicum proliferum Lam. 



In the southeastern part of the state. Lincoln; Talmage. 



2. Panicum flexile (Gattinger) Scrib. 

 (South Dakota.) 



3. Panicum capillare L. 



A common weed over most of the state. Ewing; Halsey; Lincoln; 

 Stanton County;' Valentine. 



4. Panicum barbipulvinatum Nash. 



A common weed all over the state. Belmont; Box Butte County; Cen- 

 tral City; Dismal River; Grant County; Hooker County; Niobrara; 

 North Platte; Simeon; Whitman. 



5. Panicum virgatum L. 



Common on the rairies over most of the state. Broken Bow; Craw- 

 ford; Franklin; Hardy; Lincoln; Mullen; North Platte; Pishelville; 

 Talmage; Thedford; Valentine. 



6. Panicum depauperatum Muhl. 

 Atkinson; Ewing. 



7. Panicum perlongum Nash. 

 Ewing. 



8. Panicum linearifolium Scribn. 

 (Kansas & Minnesota.) 



10. Panicum hauchucae Ashe. 

 Panicum unciphyllum Trin. 



Ewing; Loup City; Thomas County; Valentine. 



11. Panicum huachucae var. silvicola Hitch. & Chase. 



Common over most of the state. Ewing; Grand Island; Kearney; Nat- 

 tick; Pishelville; Thedford. 



12. Panicum tennesseense Ashe. 

 Minden, 



13. Panicum praecocius Hitch. & Chase. 

 Broken Bow; Grand Island. 



