368 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



bolus serotinus A. Gray; S. uniforus Scribn. and Merr.) — Bogs and 



wet meadows, Newfoundland to Michigan and New Jersey (fig. 753). 



16. Muhlenbergia pungens Thurb. (Fig. 754.) Perennial, with 



Figure 749.— Muhlenbergia asperifolia. Plant, X 1; glumes and floret, X 10. (Griffiths 212, S.Dak.) 



strong creeping rhizomes; culms tufted, erect from a decumbent leafy 

 base, 20 to 40 cm tall, sometimes taller; blades short, involute, sharp- 

 pointed; panicle long-exserted, 

 open, oblong, 5 to 15 cm long; the 

 main branches 3 to 5, these divid- 

 ing into fascicles of capillary finally 

 spreading or divaricate very sca- 

 brous branchlets; spikelets purple 

 to brownish, 4 to 5 mm long, the 

 glumes about one third as long, sca- 



Figure 750.— Distribution of 

 Muhlenbergia asperifolia. 



brous, often erose or toothed, the 

 midnerve extending into a short 

 awn ; lemma terete, tapering into an 

 awn about 1 mm long; palea about 

 as long as the lemma, the keels awn- 

 tipped. % — Dry hills and 

 sandy plains, South Dakota, Col- 

 orado, and Utah to New Mexico FlGURE 751 -— Muhlenbergia torreyana. Plant, X 1; 



and Arizona (fig. 755). glumes and floret ' x ia (Vasey ' NJ) 



17. Muhlenbergia filiculmis Vasey. Slimstem muhly. (Fig. 756.) 

 Culms densely tufted, erect, filiform, 10 to 20 cm tall, the leaves in 

 a short basal cluster; ligule prominent; blades involute, filiform, 

 mostly less than 5 cm long; panicle slender, the branches erect, 

 mostly 2 to 5 cm long, sometimes as much as 10 cm; spikelets about 



