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



or awn-pointed; lemma firm, acuminate, scabrous, shorter than the 

 glumes, the awn attached about one fourth below the tip, not much 

 exceeding the lemma, the callus hairs copious, about two-thirds as 

 long; rachilla about 1 mm long, glabrous below, with a brush of long 

 white hairs at the tip about equaling the lemma. Ql — Bogs and 

 moist ground, Maine to New York, south to Alabama (fig. 635). 



19. Calamagrostis scopulorum Jones. (Fig. 

 636.) Pale, glaucous; culms erect, 50 to 80 

 cm tall, with short rhizomes; blades elongate, 

 flat, scabrous, 3 to 7 mm wide; panicle pale 

 to purplish, contracted, sometimes spikelike, 8 

 to 15 cm long ; glumes 4 to 6 mm long, somewhat 

 scabrous, acute or acuminate, not awn-pointed; 

 lemma about as long as the glumes, minutely 

 pilose, the awn attached above the middle, 

 straight, about as long as the lemma, the callus hairs about two-thirds 

 as long; rachilla rather sparsely long-pilose, especially on the upper 

 part. % — Moist soil in gulches, Wyoming (Wild Cat Peak), 

 Colorado (Pagosa Peak), and Utah. 



20. Calamagrostis inexpansa A. Gray. Northern reedgrass. 

 (Fig. 637.) Culms tufted, 40 to 120 cm tall, with rather slender 

 rhizomes, often scabrous below the panicle; sheaths smooth, or some- 

 what scabrous, the basal ones numerous, withering but persistent; 

 ligule 4 to 6 mm long; blades firm, rather rigid, flat or loosely involute, 

 very scabrous, 2 to 4 mm wide; panicle 

 narrow, dense, the branches mostly erect and 

 spikelet-bearing from the base; 5 to 15 cm 

 long ; glumes 3 to 4 mm long, abruptly acumi- 



Figure 635.— Distribution of 

 Calamagrostis cinnoides. 



Figure 636.— Calamagrostis scopulorum. Panicle, X 1; 

 glumes and floret, X 10. (Jones 1145, Utah.) 



Figure 637. — Calamagrostis in- 

 expansa. Panicle, X 1; glumes 

 and floret, X 10. (Ehlers 566, 

 Mich.) 



nate, scaberulous; lemma as long as glumes, scabrous, the awn attached 

 about the middle, straight or nearly so, about as long as glumes, the 

 callus hairs half to three-fourths as long; rachilla 0.5 mm long, some 

 of the hairs reaching to tip of lemma. % — Meadows, marshes, and 

 wet places, Greenland to Alaska, south to Maine, New York, Illinois, 

 Missouri, Nebraska, New Mexico, and California (fig. 638). Cala- 

 magrostis inexpansa var. novae-angliae Stebbins. Panicle more 

 loosely flowered, the longer branches naked below. % — Wet granite 

 ledges, Maine to Vermont. Calamagrostis inexpansa var. bar- 

 bulata Kearney. Culms robust, puberal ent below the nodes; collar of 

 sheaths puberulent; awn minute or obsolete, callus hairs nearly as 

 long as the lemma. % — Known only from Mason County, Wash. 



