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



blades slender, scabrous on the upper 

 surface, flat or soon involute, espe- 

 cially toward the tip, about as long 

 as the culms, the two cauline shorter, 

 about 1 mm. wide ; panicle pyramidal, 

 5 to 15 cm. long, rather open, the 

 lower branches in whorls, ascending, 

 naked below, 3 to 5 cm. long; spike- 

 lets pale or tinged with purple ; glumes 

 acuminate, 6 to 7 mm. long; lemma 

 acuminate, a little shorter than the 

 glumes, the awn attached about 2 

 mm. above the base, geniculate, ex- 

 serted about 1 cm.; callus hairs and 

 those of the rachilla about half as long 

 as the lemma. % — Perpendicular 

 cliffs, near Columbia River and its 

 tributaries, Washington and Oregon. 



3. Calamagrostis brewer i Thurb. 

 Shorthair. (Fig. 425.) Culms densely 

 tufted, slender, erect, 15 to 30 cm. 

 tall; leaves mostly basal, usually 

 involute-filiform; panicle ovate, pur- 

 ple, 3 to 8 cm. long, the lower 

 branches slender, spreading, few- 

 flowered, 1 to 2 cm. long; glumes 3 

 to 4 mm. long, smooth, acute; lemma 

 nearly as long as glumes, cuspidate- 

 toothed, the awn from near the base, 

 geniculate, exserted, twisted below, 

 about 2 mm. long above the bend, the 

 callus hairs short, scant; rachilla 

 long-pilose, about half as long as the 

 lemma. % — Mountain meadows 

 of the high Sierra Nevada, Calif., 

 where it is an important range grass. 



4. Calamagrostis tweedyi (Scribn.) 

 Scribn. (Fig. 426.) Culms erect, 1 to 

 1.5 m. tall, smooth, with short rhi- 

 zomes; sheaths smooth, the lower be- 

 coming fibrous ; blades flat, somewhat 

 scabrous, the cauline 5 to 15 cm. long, 

 as much as 1 cm. wide, those of the 

 innovations narrower and longer; 

 panicle oblong, rather compact, or in- 

 terrupted below, about 10 cm. long; 

 glumes abruptly acuminate, purple- 

 tinged, 6 to 7 mm. long; lemma about 

 as long as the glumes, the awn ex- 

 serted about 5 mm., the callus hairs 

 scant, scarcely 1 mm. long; rachilla 



Figure 425.— Calamagrostis breweri. Plant XI; pilose, 2 mm. long. % Moist 



glumes and floret, X 10. (Bolander 6098, Calif.) ^ ' . , tit i rM l J 



open alpine slopes, Idaho and Cleland 

 cm. tall; sheaths smooth or slightly Counties, Idaho, and Kittitas Coun- 

 scabrous; ligule 2 to 8 mm. long; ty and Cascade Mountain, Wash. 



