322 



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



as long as the lemma; callus and ra- 

 chilla hairs rather copious, three- 

 fourths to nearly as long as the lem- 

 ma. Q| — Only known from Lake of 

 the Clouds, Mount Washington, N.H. 

 16. Calamagrostis pickeringii A. 

 Gray. (Fig. 438.) Culms solitary or 

 few in tufts, rather rigid, scabrous be- 

 low the panicle, 30 to 60 cm. tall, 

 with creeping rhizomes; blades erect, 

 flat, 4 to 5 mm. wide; panicle pur- 

 plish, erect, contracted and rather 



Figuhe 438. — Calamagrostis pickeringii. Panicle, X 1 ; 

 glumes and floret, X 10. (Hubbard 634, Mass.) 



dense, 7 to 12 cm. long; glumes acute, 

 about 4 to 4.5 mm. long; lemma a 

 little shorter than the glumes, sca- 

 berulous, 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 in 2 tufts, 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 Massachusetts 

 and New York; Isle Roy ale, Mich. 

 Slender plants with slightly smaller 

 spikelets have been differentiated as 

 C. pickeringii var. debilis (Kearney) 

 Fern, and Wieg. 



17. Calamagrostis nutkaensis 

 (Presl) Steud. Pacific reedgrass. 

 (Fig. 439.) Culms stout, 1 to 1.5 m. 

 tall with short rhizomes (not usually 



Figure 439. — Calamagrostis nutkaensis. Panicle, X 1; 

 glumes and floret, X 10. (Hitchcock 23576, Oreg.) 



present in herbarium specimens); 

 ligule 3 to 8 mm. long; blades elon- 

 gate, 6 to 12 mm. wide, flat, becoming 

 involute, gradually narrowed into a 

 long point, scabrous; panicle usualfy 

 purplish, narrow, rather loose, 15 to 

 30 cm. long, the branches rather stiffly 

 ascending; glumes 5 to 7 mm. long, 

 acuminate; lemma about 4 mm. long, 

 indistinctly nerved, the awn rather 

 stout, from near the base, slightly 

 geniculate, about equaling the lemma 

 or shorter; hairs of callus and rachilla 

 scarcely half as long % — Along 

 the coast in moist soil or wet wooded 

 hills, from Alaska to central Cali- 

 fornia. 



18. Calamagrostis densa Vasey. 



CUYAMACA REEDGRASS. (Fig. 440.) 



Culms rather stout, densely tufted, 

 smooth or scabrous just below the 

 panicle, mostly more than 1 m. tall, 

 with rather stout rhizomes; sheaths 

 slightly scabrous; ligule 3 to 5 mm. 

 long; blades flat, or subinvolute, sca- 

 brous, 15 to 25 cm. long, 3 to 8 mm. 

 wide, the uppermost shorter; panicle 

 spikelike, dense, pale, 10 to 15 cm. 

 long; glumes 4.5 to 5 mm. long, acu- 

 minate, scaberulous; lemma 3.5 to 4 

 mm. long, the awn bent, about as long 

 as the lemma, more or less exserted 

 at the side, the hairs of callus and ra- 



