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



about 1 mm long. % — Dry hills, among shrubs, mountains east of 

 San Diego, Calif. 



13. Calamagrostis koelerioides Vasey. (Fig. 625.) Differs from 

 C. densa in the more slender culms and (often purplish) panicles. 

 % — Dry hills, banks, and meadows, Wyoming to Washington, south 

 to southern California. (Fig. 626.) Probably a form of C. densa. 



Figure 624. — Calamagrostis densa. 

 Panicle, X 1; glumes and floret, 

 X 10. (Hitchcock 13163, Calif.) 



Figure 625.— Calamagrostis koelerioides, X 10. 

 (Hitchcock 23558, Oreg.) 



14. Calamagrostis pickeringii A. Gray. (Fig. 627.) Culms soli- 

 tary or few in tufts, rather rigid, scabrous below the panicle, 30 to 60 

 cm tall, with creeping rhizomes; blades erect, flat, 4 to 5 mm wide; 

 panicle purplish, erect, contracted and rather dense, 7 to 12 cm long; 

 glumes acute, about 4 to 4.5 mm long; lemma a little shorter than the 

 glumes, scaberulous, narrowed to an obtuse 

 point, the awn attached about 1 mm above the 

 base, about as long as the lemma, slightly bent 

 and protruding somewhat from the side of the 

 glumes; callus hairs scant, about 0.5 mm long; 



rachilla about 1 mm long, 



the hairs short, rather 



scant. % — Bogs, wet 



meadows, and sandy 



beaches, Newfoundland 



and Labrador to the 



mountains of Massachu- 

 setts and New York; Isle 



Royal, Mich. (fig. 628). 



slightly smaller spikelets 



C. 'pickeringii var. 



Figure 626.— Distribution of 

 Calamagrostis koelerioides. 



Slender plants with 



have been differentiated as 



debilis (Kearney) Fern, and Wieg. 



15. Calamagrostis scribneri Beal. Scribner 

 reedgrass. (Fig. 629.) Culms tufted, with 

 numerous creeping 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 purplish, narrow but rather 



Figure 627 '.—Calamagrostis 

 pickeringii. Panicle, X 1; 

 glumes and floret, X 10. 

 (Hubbard 634, Mass.) 



