406 



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



Figure 574. — Muhlenbergia setifolia. Plant, X 1; glumes and floret, X 10. (Hitchcock 13507, N. Mex.) 



uous, the branchlets and pedicels 

 finally spreading; spikelets, excluding 

 awns, 3 to 4 mm. long, the glumes 

 one-fourth to two-thirds as long, 

 acute, the second often short-awned; 

 lemma scaberulous, minutely hairy on 

 the callus and with a delicate awn 5 

 to 15 mm. long. % — Rocky or 

 sandy woods, Massachusetts to Indi- 

 ana and Kansas, south to Florida and 

 Texas; West Indies, eastern Mexico. 

 Muhlenbergia capillaris var. 

 fIlipes (M. A. Curtis) Chapm. ex 

 Beal. Culms stouter; blades mostly 

 involute; glumes with delicate awns, 

 mostly longer than the lemma; lemma 

 with a delicate setaceous tooth each 

 side of the awn. % (M. filipes M. 

 A. Curtis.) — Moist pine barrens near 



the coast, North Carolina, Florida, 

 Mississippi, and Texas. 

 63. Muhlenbergia rigida (H. B. K.) 



Kunth. Purple muhly. (Fig. 582.) 

 Perennial, densely tufted; culms erect, 

 60 to 100 cm. tall; leaves crowded at 

 base, old sheaths persistent, the 

 sheaths with auricles 2 to 5 mm., 

 rarely longer; blades flat or soon in- 

 volute, flexuous, those of the innova- 

 tions involute; panicle dark purple, 

 narrow, finally loose and open, 15 to 

 30 cm. long, the capillary branches 

 ascending, the lower as much as 10 

 cm. long; spikelets, excluding awns, 

 about 4 mm. long, the glumes from 

 minute to about one-fourth as long, 

 acute to erose-obtuse; lemma strongly 

 nerved, hairy on the callus and with a 



