MANUAL OP THE GRASSES OF THE UNITED STATES 



313 



Figure 621.— Distribution 

 Calamagrostis porteri. 



rather scant, nearly half as long as the lemma; rachilla hairs scant, 

 extending to about 3 mm. % — Dry rocky soil, New York, Penn- 

 sylvania, Virginia (Luray), and West Virginia (fig. 621). 



10. Calamagrostis perplexa Scribn. (Fig. 622.) 

 Resembling C. porteri, differing in the somewhat 

 larger, denser panicle and in the more copious callus 

 hairs about three-fourths as long as the lemma, and 

 in the more delicate awn. % — Wet rocks and 

 sandy shores, Maine (Elliotsville), New Hampshire 

 (White Mountains), New York (Thatcher's Pinnacle, 

 near Ithaca, type locality), 

 Ontario (Lake Nipagon), and 

 Minnesota (Fond du Lac). 



11. Calamagrostis nut- 

 kaensis (Presl) Steud. (Fig. 

 623.) Culms stout, 1 to 1.5 m 

 tall with short rhizomes (not 

 usually present in herbarium 

 specimens) ; ligule 6 to 8 mm 



long; blades elongate, 8 to 12 mm wide, flat becom- 

 ing involute, gradually narrowed into a long point, 

 scabrous; panicle usually 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 

 grostis porteri, x io. 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 California, 

 12. Calamagrostis densa Vasey. Cuyamaca reed- 

 grass. (Fig. 624.) 

 Culms rather stout, 

 densely tufted, 

 smooth or scabrous 

 just below the pan- 

 icle, mostly more 

 than 1 m tall, with 

 rather stout rhi- 

 zomes; sheaths 

 slightly scabrous ; 

 ligule 3 to 5 mm 

 long; blades flat, or 

 subin volute, sca- 

 brous, 15 to 25 cm 

 long, 3 to 8 mm 

 wide, the uppermost 

 shorter; panicle 

 spikelike, dense, 



Figure 622.-Calama- pale, 10 to 15 Cm 

 grostis perplexa. f i . _ , 



Glumes and floret, long; glumes 4.5 to Figure 623. 



lf 5 mm long, acumi- 

 nate, 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 rachilla scant, 



10. (Metes 



N.Y.) 



Calamagrostis nutkaensis. Panicle, 

 X 1; glumes and floret, X 10. (Hitchcock 23576, 

 Oreg.) 



