152 . SYNOPSIS OF THE FLORA OF COLORADO. 



coin at 12,000 feet, Weston's Pass, Twin Lakes and Sierra Madre Range, 

 Coulter. 



AiRA DANTHONIOIDES, Trin. Steud. Gram., 221. Annual, glabrous; 

 culins very slender. 3'-3 high, geniculate at base; sheaths smooth, ex- 

 ceeding the internodes; lignles elongated; leaves short ('-4') and very 

 narrow or convolute-setaceous; panicle diffuse, the capillary branchlets 

 2-4 together and naked below; glumes 2-flowered, with the plumose 

 rudiment of a third, 2 // -3 // long, exceeding the flowers; lower palet trun- 

 cate and denticulate, l"-li" long, awned below the middle, the awn 

 2" -A" long, geniculate; grain free, fiattish, not grooved. Summit of 

 Gray's Peak, Dr. Smith. 



HIEROCHLOA BOREALIS, B. & S. Hall & Harbour, C28. Canon City, 

 Brandegee. Clear Creek canon, Coulter. 



PHALARIS ARUNDINACEA, L. Canon City, Brandegee. 



P ASP ALUM SETACEUM, MX. Hall & Harbour, 653. 



BECKMANNIA 1 ERUC^EFORMis, Host. Steud. Gram., 15. Culms stout, 

 lo_3jo high, erect from an ascending base, with the sheaths glabrous ; 

 ligules elongated ; leaves linear, 4 / -8 / long and 2"-6" wide, flat, acute, 

 scabrous ; panicle 4 / -12 / long, erect, strict, secuud, the short, crowded 

 branchlets densely flowered from the base, glabrous ; spikelets sessile, 

 imbricately arranged in two rows, nearly orbicular, 1J ;/ in diameter, the 

 upper rudimentary floret minute, stipitate. Hall and Harbour, 658. 

 Near Denver, Dr. Smith. 



PANICUM CAPILLARE, L. Canon City, Brandegee. 



PANICUM VIRGATUM, L. Near Denver, Dr. Smith. 



PANICUM AMARUM, Ell. Canon City, Brandegee. 



PANICUM PAUCIFLORUM, Ell. Canon City, Brandegee. 



PANICUM CRUS-GALLI, L. Near Denver, Dr. Smith. Canon City 

 Brandegee. Introduced. 



SETARIA VIRIDIS, Beauv. Canon City, Brandegee. Introduced. 



SETARIA ITALICA, Kunth. Canon City, Brandegee. Introduced. 



CENCHRUS TRIBULOIDES, L. Canon City, Brandegee. 



ANDROPOGON FURCATUS, Muhl. Divide between Denver and Colo- 

 rado Springs, Porter. 



ANDROPOGON SCOPARIUS, MX. Canon City and Wet Mountain Yal- 

 ley, Brandegee. 



ANDROPOGON ARGENTEUS, Ell. Hall & Harbour, 651. Canon City, 

 Brandegee. 



SORGHUM NUTANS, Gray. Cafion City, Brandegee. 



EQUISETUM ARVENSE, L. Near Denver, Dr. Smith. Clear Creek, Coul- 

 ter. 



EQUISETUM PRATENSE, Ehrh. Mt. Lincoln, Twin Lakes and Sierra 

 Madre Range, Coulter. 



1 BECKMANNIA, Host. Panicle racemose, contracted. Spikelets compressed, 2-flowered, 

 the upper floret an abortive rudiment. Glumes 2, ob ovate, compressed boat-shaped. 

 subcoriaceous, equal, a little shorter than the flower, pointless. Palets membranous. 

 the lower ovate, concave, acutish. mucronate, 3-nervcd, the upper 2-uerved, bifid, 

 Stamens 3. Styles 2, with elongated plumose stigmas. Scales 2. bifid, glabrous. Grain 

 free, glabrous. A coarse perennial aquatic, 



