23 



* * Sjnkehts not slroiujlij compressed, empty (jluines not stromjhj keeled. 

 t Ccespitose, culms nsHally somewhat riijid, leaf-blades usuallij involute — Rockij Mountains 



and westward. 

 16. CALAMAGROSTIS FASCICULATA Kearney, sp. n. (Fig. 1.) 

 Somewhat glaucous, \Tith long, slemler, scaly, creeping rootstocks, often with ascend- 

 ing loafy stolons, numerous very short, erect innovations forming a dense tuft, 

 and slender culms very leafy toward base. Culms 6 to 9 dm. long, usually 

 geniculate or even slightly arcuate near hase, then erect and rather strict ; inter- 

 nodes 3 to 4 (mostly 1), all but the lowest finally exceeding their sheaths, tho 

 highest ultimately much more than twice as long as both sheath and blade. 

 Sheaths minutely scabrous, the lower ones bearded at junction with the blade, 

 usually purplish. Ligule 4 to 5 mm. long, pointed, very thin. Blades (of 

 innovations) 10 to 20 (mostly 15) 

 cm. long, 2 to 3 nun. wide; upper- 

 most cauline 4 to 7 cm. long, about 

 2 mm. wide; all strongly involute, 

 erect, rather rigid, minutely and 

 densely scabrous on the nerves 

 and margins. Panicle 5 to 10 cm. 

 long, about 1 cm. wide, lanceolate, 

 acute, contracted, much inter- 

 rupted, dull brown tinged with 

 red-purple; rachis slender, min- 

 ntely scabrous, its lowest inter- 

 node 5 to 1.5 mm. long; branches 

 short, appressed, densely flow- 

 ered, scabrous-pubescent, the low- 

 er primary branches in 3's or 5's, 

 the longest about 15 mm. long. 

 Spikelets about 4 mm. long; 

 empty glumes oblong-lanceolate 

 or lanceolate, acutish to sharp- 

 acuminate, thin-membranous, sca- 

 brous on the back, especially along 

 the keel, nearly equal or the first 

 somewhat longer. Flowering- 

 glume equaling or somewhat 

 shorter than the empty glumes, 

 oblong-ovate, broadly truncate, 

 minutely 4-dentate, thin,, sca- 

 brous on the back ; awn attached 

 about one-fourth above the base, 

 usually conspicuously exceeding 

 the glume ('sometimes merely 

 equaling it), stout, bent about 

 one-third below its apex, the low- 

 er part twisted, the ufjper part 

 divergent at an angle of about 45 

 degrees, exserted, usually dark 

 purple. Palea nearly equaling to 

 slightly exceeding the flowering glume, oblong-lanceolate, narrowly truncate, al- 

 most entire or minutely bidentate at apex, minutely roughened and olteu purplish 

 along the keels. Callus hairs very sparse, mostly lateral, the longer two-fifths 

 to two-thirds as long as the flowering glume. Frolongation of tho rachilla 

 sparsely bearded, with its hairs one-sixth to one-third shorter than the palea 

 (or sometimes minute with a few very short hairs). 



Fig. l.—Oalamafjr.ottis fasciculata Kearney: a, 

 empty glumes: b, Horet; c, rudiment or prolongation 

 of rachilla. 



