ALOPECURUS. CLXI. GRAMINE^E. 601 



glumes, surrounded with hairs at base ; scales linear-lanceolate, 

 longer than caryopsis ; styles 3-parted ; stig. 3. 



P. ARENARIA. Palis. (Arundo. Linn. Ammophila. Lindl.) Mat Grass. 



Rt. creeping extensively ; st. erect, rigid, 2 41' high ; Ivs. involute, If by J', 

 smooth and glaucous, pungently acute ; sheaths smooth ; slip, oblong ; panicle 

 dense, with erect, appressed branches, 610' long, and an inch thick ; spikelets 

 compressed, greenish- white ; lower pokes longer than the upper. TJ. On sandy 

 sea-coasts, Can. to N. J. At Dorchester, Mass., this grass is extensively manu- 

 factured into paper. Aug. 



13. CALAMAGROST1S. Adans. 



Name compounded of Calamus and Agrostis. 



Panicle contracted ; glumes 2, subequal, acute or acuminate ; 

 paleae 2, mostly shorter than the glumes, surrounded with hairs at 

 base, lower one mucronate, mostly awned below the tip, the upper 

 one often with a stipitate pappus at base. 



1. C. CANADENSIS. Palis. (C. Mexicana. Nutt. C. agrostoides. Ph. Arundo. 

 Michx.} Reed Grass. Blue-joint. St. smooth, erect, rigid, 3 5f high ; Ivs. 



linear-lanceolate, striate, with smooth, veined sheaths ; panicle erect, rather 

 loose, oblong, the branches capillary, aggregated in 4s and 5s; glumes very 

 acute, smoothish, much longer than the paleae ; lower pakce bifid at the apex, 

 with an exserted awn arising from below the middle of the back. 7J. Wet 

 grounds, N. Eng. W. to Mich. Makes good hay. Common. Aug. 



2. C. COARCTATA. Torr. (Agrostis glauca. MM. Arundo stricta. Spr.) 

 Glaucous ; st. erect, 2 if high ; Irs. linear-lanceolate, scabrous, with the 



veins and keel white ; sheaths striate ; slip, oblong, obtuse ; panicle condensed and 

 spike-form, the branches rigidly erect, short and aggregated ; glumes acuminate, 

 lanceolate,lower 1-veined, upper 3-veined ; lower pakce 5-veined, bifid at the 

 apex, with a short, straight awn a little below the tip. 1\. Bogs, Free States and 

 Brit. Am. July, Aug. 



3. C. BREVIPILIS. Torr. (A. Epigeios. Muhl.') 



St. terete, 3 4f high ; Ivs. broad-linear, the sheaths glabrous ; stip. hairy ; 

 panicle pyramidal, loose, with the diffuse, capillary branches solitary or in pairs; 

 glumes unequal, bearded at base, acute, 1-veined. shorter than the equal, obtuse, 

 awnless palese ; pappus very short, not half the length of the paleae. 7L In 

 sandy swamps, N. J., Torrey. 



4. C. PURPURASCENS. Brown. (C. sylvatica. Trin.} 



Panicle spicate ; glumes scabrous ; palcce 2, the lower scabrous, 4-toothed 

 at the apex, awned upon the back ; abortive rudiment plumose, twice longer 

 than the hairs at its base. White Mts., N. H., Titckerman. Rocky Mis., Rich- 

 ardson. Very rare and unimportant. 



5. C. INEXPANSA. Gray. 



St. 2 5f high, erect, simple ; Ivs. 2 3" wide, smooth ; panicle 4 8' long, 

 slender, contracted, branches short, appressed, 4 or 5 together ; glumes oblong- 

 lanceolate, 2" long, rough on the keel and sides, acute ; palece nearly equal, 

 acute, oblong, as long as the glumes, lower one rough, 3-veined, notched at tip, 

 with a short awn inserted below the middle, nearly as long as the flower. 

 Penn Yan, N. Y. Sartwell. Aug. 



TRIBE 3. PHLEOIDEJS. Infloresence in dense, cylindric or unilateral 

 spikes. Spikelets 1-flowered. Glumes 2, of nearly similar texture with the 

 paleae. 



14. ALOPECtJRUS. 

 Glumes subequal, connate, distinct ; palese united into an inflated 



glume, cleft on one side below the middle, generally awned ; styles 



often connate. 



