MANUAL OF THE GRASSES OF THE UNITED STATES 309 



4. Calamagrostis tweedyi (Scribn.) Scribn. (Fig. 612.) Culms 

 erect, 1 to 1.5 m tall, smooth, with short rhizomes; sheaths smooth, 

 the lower becoming fibrous ; blades flat, somewhat scabrous, the cauline 



5 to 15 cm long, as much as 1 cm wide, those of the innovations 

 narrower and longer; panicle oblong, rather compact, or interrupted 

 below, about 10 cm long; glumes abruptly acuminate, purple- tinged, 



6 to 7 mm long; lemma about as long as the glumes, the awn exserted 

 about 5 mm, the callus hairs scant, scarcely 1 mm long; rachilla 



FIGURE 6W. Calamagrostis howellii. Panicle, X 1; glumes and floret, X 10. (Chase 4846, Oreg.) 



pilose, 2 mm long. 01 Known only from the type locality, the 

 "Cascade Mountains, Washington." 



5. Calamagrostis foliosa Kearney. (Fig. 613.) Culms tufted, 

 erect, 30 to 60 cm tall; leaves numerous crowded toward the base, 

 the sheaths overlapping, the blades involute, firm, smooth, nearly as 

 long as the culm; panicle pale, dense, spikelike, 5 to 12 cm^long; 

 glumes about 1 cm long, acuminate ; lemma 5 to 7 mm long, acuminate, 

 the apex with 4 setaceous teeth, the awn from near base, geniculate, 

 about 8 mm long above the bend, the callus hairs numerous, 3 mm long; 

 rachilla pilose, nearly as long as lemma. 01 Humboldt and 

 Mendocino Counties, Calif. 



