MANUAL OF THE GRASSES OF THE UNITED STATES 



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Figure 440. — Calamagrostis densa. Panicle, X 1; 

 glumes and floret, X 10. (Hitchcock 13163, Calif.) 



chilla scant, about 1 mm. long. % 

 — Dry hills, among shrubs, moun- 

 tains east of San Diego, Calif. 



19. Calamagrostis koelerioides 

 Vasey. (Fig. 441.) Differs from C. 

 densa in the more slender culms and 

 (often purplish) panicles; lemma 

 nearly as long as the glumes. % 

 — Dry hills, banks, and meadows, 

 Wyoming to Washington, south to 

 southern California. Possibly a form 

 of C. densa. 



20. Calamagrostis scribneri Beal. 



SCRIBNER REEDGRASS. (Fig. 442.) 



Culms tufted, with numerous creep- 

 ing rhizomes, slender, 60 to 100 cm. 

 tall; lower sheaths loose, thin, upper 

 scabrous, retrorsely pubescent on the 

 collar; ligule about 5 mm. long; 

 blades thin, elongate, 4 to 7 mm. 

 wide, scabrous; panicle pale or pur- 

 plish, narrow but rather lax, 10 to 

 15 cm. long (rarely longer); glumes 

 about 4 mm. long, acuminate; lemma 

 a little shorter than the glumes, 

 sharply toothed, the awn about as 

 long as the glumes or a little longer, 

 feebly bent, the callus hairs about 

 half as long as the lemma; rachilla 

 minute, its hairs nearly as long as 

 the lemma. % — Moist meadows, 

 Montana and Washington to New 

 Mexico; infrequent. 



21. Calamagrostis canadensis 

 (Michx.) Beauv. Bluejoint. (Fig. 



443, A.) Culms suberect, tufted, 60 to 

 150 cm. tall, with numerous creeping 

 rhizomes; sheaths glabrous or rarely 

 obscurely pubescent; blades numer- 

 ous, elongate, flat, rather lax, sca- 

 brous, 4 to 8 mm. wide; panicle 

 nodding, from narrow and rather 

 dense to loose and relatively open, 

 especially at base, 10 to 25 cm. long; 

 glumes usually 3 to 4 mm. long, 

 smooth or more commonly scabrous, 

 acute to acuminate; lemma nearly as 



Figure 441. — Calamagrostis koelerioides. Glumes 

 and floret, X 10. (Hitchcock 23558, Oreg.) 



Figure 442. — Calamagrostis scribneri. Panicle, X 1 ; 

 glumes and floret, X 10. (Rydberg 3083, Mont.) 



