Family POACEA&® 55 
mont; Box Butte county; Chadron; Cheyenne county; Crawford; 
Mullen; Sioux county. 
11. Muhlenbergia. 99. 
Panicle narrow, spike-like; branches short, not spreading. 
Flowering scales awnless or awn-pointed, 
Empty scales longer than the flowering scales. 1. M. racemosa. 
Empty scales not longer than the flowering scales. 
Empty scales about as long as the flowering scales. 
Stems much branched; rhizomes present. 2. M. mexicana. 
Stems little branched; without rhizomes. 3. M. cuspidata. 
Empty scales about half as long as the flowering scales. 
Perennials, with scaly rootstocks. 4. M. richardsonis. 
Annuals, without rootstocks. 5. M. simplex. 
Flowering scales with awns as long as the scales or longer. 
Empty scales about as long as the flowering scales. 
6. M. umbrosa. 
Empty scales much shorter than the flowering scales. 
Empty scales about half as long as the flowering scales. 
7. M. tenuiflora. 
Empty scales about one-fourth as long as the flowering scales. 
8. M. schreberi. 
Panicle open, its branches long and spreading. 9. M. pungens. 
1. Muhlenbergia racemosa (Michx.) B. S. P. Wild Timothy. 
Common in wet soil over most of the state. Belmont; Halsey; 
Kearney; Lincoln; O’Neill; Thedford; Valentine. 
2. Muhlenbergia mexicana (L.) Trin. Wood-grass. 
Common in meadows and along streams throughout the state. Dis- 
mal river; Halsey; Kennedy; Natick; Neligh; Red Cloud; Thedford; 
Valentine; Wahoo; Weeping Water. 
3. Muhlenbergia cuspidata (Torr.) Rydb. 
Sporobolus cuspidatus Wood. 
In dry soil over most of the state. Belmont; Cass county; Cherry 
county; Cheyenne county. 
4. Muhlenbergia richardsonis (Trin.) Rydb. 
Sporobolus brevifolius Nash. 
In the western part of the state. Cody; Kennedy; Lincoln; Minden. 
5. Muhlenbergia. simplex (Scribn.) Rydb. 
Sporobolus simplex Scribn. 
In the western part of the state, according to Rydberg’s Flora of 
Colorado. 
6. Muhlenbergia umbrosa Scribn. 
In woods along streams. Ewing; Orleans; Valentine. 
7. Muhlenbergia tenuiflora (Willd.) B. S. P. 
Grand Island; Red Cloud. 
8. Muhlenbergia schreberi Gmel. Nimble-will. 
In dry soil in the southeastern part of the state. Lincoln; Red 
Cloud; Valley county. 
9. Muhlenbergia pungens Thurb. Blowout-grass. 
In the sand-hills, frequently in “blowouts”. Belmont; Dismal river; 
Haigler; Hat Creek basin; Minden; Mullen; Valentine. 
