STANDLEY FLORA OF GLACIER PARK. 285 



11. CALAMAGROSTIS Adans. Reedgrasp. 



Erect perennialg resembling Agrostis, distinguished from that genus by the tuft 

 of silky hairs at the base of the floret, by the well-developed palea, and by the 

 development of a rachilla joint in the form of a little bristle back of the palea; lemma 

 always awned from below the middle of the back. 



Awn about t-svice as long as the glumes, geniculate. Panicles contracted, densely 

 flowered; glumes 5 to 6 mm. long. 

 Blades coarse, 4 to 5 mm. wide; sheaths mostly overlapping; spikelets short- 



pediceled 1. C. purpurascens. 



Blades 2 to 3 mm. wide, subinvolute; sheaths not overlapping; most of the 



spikelets on pedicels nearly as long as the glumes 2. C. vaseyi. 



Awn scarcely exceeding the glumes or included in them. 



Panicle loose and nodding 6. C. canadensis. 



Panicle contracted, rather densely flowered. 

 Leaves densely pubescent at the junction of sheath and blade; awn geniculate, 

 protruding sidewise from the glumes; hairs at base of floret less than half as 



long as the lemma " 3. C. rubescens. 



Leaves glabrous at the junction of sheath and blade; awn straight, not protruding 

 sidewise; hairs at base of floret copious, nearly as long as the lemma. 



Blades rough, firm, 2 to 7 mm. wide 4. C. inexpansa. 



Blades smooth, soft, not over 3 mm. wide 5. C. neglecta. 



1. Calamagrostis purpurascens R. Br. Found at all altitudes, on shaded banks, 

 rocky slopes, or cliffs. Alaska to Calif., Colo., S. Dak., and Greenl.- — Plants in small 

 tufts, 20 to 30 cm. tall, rather stout, the base of the culms clothed with old weather- 

 worn leaves; panicle purplish, 5 to 10 cm. long, 1 to 1.5 cm. thick. 



2. Calamagrostis vaseyi Beal. Collected on trail to Sperry Glacier by Holzinger. 

 Wash, and Oreg. to Mont. — Plants in tufts, the knotty base with numerous leafy 

 shoots, the culms sometimes spreading and geniculate below; panicle mostly tawny 

 or pale, less dense than in P. -purpurascens. 



3. Calamagrostis rubescens Buckl. At low and middle altitudes, in thin woods 

 or on open slopes or rocks. B. C. and Alta. to Wyo. and Calif. — Plants in small 

 tufts, 50 to 90 cm. tall, with numerous long rough blades 2 to 5 mm. wide, and pale 

 or purplish, shining panicles 10 to 15 cm. long; glumes glabrous, acuminate. 



4. Calamagrostis inexpansa A. Gray. Frequent at low altitudes, in woods. B. C. 

 and Wash, to Colo., N. J., and N. Y. — Plants single or few together, often with 

 running rootstocks; culms 0.7 to 1 meter or more tall; blades elongate, involute 

 toward the very rough ends; panicles mostly tawny and 12 to 20 cm. long; glumes 

 scabrous, abruptly acute. 



5. Calamagrostis neglecta (Ehrh.) Gaertn. Collected in clearings at Summit by 

 Griffiths. Alaska to Colo., Wis., Me., and Greenl.; also in Eur. — Plants more slender 

 than in C. inetpansa, and not so tall, the foliage smooth and softer, the panicles on 

 the average smaller. 



6. Calamagrostis canadensis (Michx.) Beauv. Frequent at low and middle 

 altitudes, sometimes above timber line, in meadows or swamps. Alaska to Calif., 

 N. Mex., N. C, and Newf . — Plants tufted and with running rootstocks, the numerous 

 rough elongate blades 4 to 6 mm. wide; panicle 15 to 30 cm. long, about one-third as 

 wide, the capillary branches drooping; hairs at the base of the floret copious and as 

 long as the lemma; awn inconspicuous. 



