294 



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



Figure 398. — Deschampsia congestiformis. Spikelet 

 and floret, X 10. (Type.) 



3. Deschampsia congestiformis 



Booth. (Fig. 398.) Culms in small 

 tufts, slender, 45 to 70 cm. tall, 

 scaberulous above; sheaths scaber- 

 ulous toward the summit; ligule 1.5 

 to 3 mm. long; blades flat or folded, 

 scabrous on both surfaces, 2 to 3 

 mm. wide, the basal 10 to 30 cm. 

 long, those of the culm 3 to 8 cm. 

 long, those of the innovations sub- 

 filiform; panicle long-exserted, 6.5 to 

 10 cm. long, narrow, condensed, the 

 short branches erect, the axis and 

 branches slender, hirtellous; spikelets 

 short-pediceled, appressed, 7 to 10 

 mm. long; glumes about 7 mm. long, 

 scabrous, especially on the midnerve; 

 lemmas 7 to 8 mm. long, awned from 

 near the base, toothed or lacerate at 

 the apex, sometimes splitting down 

 the back at maturity, the awn 

 twisted and geniculate, exceeding 

 the spikelets 3 to 4 mm., the callus 

 hairs about 0.5 to 1 mm. long, those 

 of the rachilla 1 to 2 mm. long. % 



— Only known from Gallatin Valley, 

 Bozeman, Gallatin County, and from 

 Cooke, Park County, Mont. 

 4. Deschampsia atropurpurea 



(Wahl.) Scheele. Mountain hair- 

 grass. (Fig. 399.) Culms loosely 

 tufted, erect, purplish at base, 40 

 to 80 cm. tall; blades flat, rather 

 soft, ascending or appressed, 5 to 10 

 cm. long, 4 to 6 mm. wide, acute or 

 abruptly acuminate; panicle loose, 

 open, 5 to 10 cm. long, the few 

 capillary drooping branches naked 

 below; spikelets mostly purplish, 

 broad; glumes about 5 mm. long, 

 broad, the second 3-nerved, exceed- 

 ing the florets; lemmas scabrous, 

 about 2.5 mm. long, the callus hairs 

 one-third to half as long, the awn 

 of the first straight, included, of the 

 second, geniculate, exserted. % — 

 Woods and wet meadows, Newfound- 



Figuke 399. — Deschampsia atropurpurea. Panicle, 

 X 1; glumes and floret, X 10. (Leiberg 2952, 

 Idaho.) 



