MANUAL OF THE GRASSES OF THE UNITED STATES 311 



6. Calamagrostis purpurascens R. Br. Purple reedgrass. (Fig. 

 614.) Culms tufted, sometimes with short rhizomes, erect, 40 to 60 

 cm or even 100 cm tall; sheaths usually scabrous, the old sheaths 



Figure 613.— Calamagrostis foliosa. Panicle, X 1; glumes 

 and floret, X 10. (Davy 6602, Calif.) 



Figure 614.— Calamagrostis purpu- 

 rascens. Panicle, X 1; glumes and 

 floret, X 10. (Goodding 375, Wyo.1 



persistent and fibrous; blades 2 to 4 mm wide, flat or more or less 

 involute, rather thick, scabrous ; panicle dense, usually pinkish or pur- 

 plish, spikelike, 5 to 12 cm long, rarely longer ; 

 glumes 6 to 8 mm long, scabrous ; lemma nearly 

 as long as glumes, the apex with 4 setaceous 

 teeth, the awn from near base, finally geniculate, 

 exserted about 2 mm ; hairs of callus and rachilla 

 about one-third as long as the lemma. 91 (C. 

 vaseyi Beal.) — Rocks and cliffs, Greenland to 

 Alaska, south to Quebec, South Dakota (Black 

 Hills), Colorado, and California (fig. 615). 

 Calamagrostis montanensis Scribn. Plains reedgrass. (Fig. 



Figure 615.— Distribution of 

 Calamagrostis purpurascens. 



7. 

 616.) 



Culms stiffly erect, scabrous below the panicle, usually 20 to 



