Alopecurus. CLXI. GRAMINEiE. 601 



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

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



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



Rt. creeping extensively; st. erect, rigid, 2 — 41' high ; Zrs. involute, If by|', 

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

 dense, with erect, appressed branches, 6 — 10' long, and an inch thick ; spikelets 

 compressed, greenish-white ; luvxr palea longer than the upper. % On sandy 

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

 factured into paper. Aug. 



13. CALAMAGROSTIS. Adans. 



Name compounded of Calamus and Asrostis. 



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. Nuit. 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; ghimcs very 

 acute, smoothish, much longer than the paleas ; Imoer folea. bifid at the apex, 

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

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



2. C. coARCTATA. Torr. TAgrostis glauca. MM. Arundo stricta. Spr.") 

 Glaucous ; St. erect, 2 — 4f high ; Us. linear-lanceolate, scabrous, with the 



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

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

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

 apex, with a short, straight awn a little below the tip. — 94. Bogs, Free States and 

 Brit. Am. July, Aug. 



3. C. BREviPiLis. Torr. (A. Epigeios. Muhl.) 



St. terete, 3 — 4f high; lis. broad-linear, the sheaths glabrous; slip, 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 palere ; papjnis very short, not half the length of the paleoe. — 7l In 

 sandy swamps, N. J., Torrey. 



4. C. PURPURAscENs. Browu. (C. sylvatica. T/in.) 



Panicle spicate ; glumes scabrous ; p'alece 2, the lower scabrous, 4-toothcd 

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

 than the hairs at its base. — White Mts., N. H., Tuckcrman. Rocky Mts., Rich- 

 ardson. — Very rare and unimportant. 



5. C. iNKXPANSA. Gray. 



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

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

 lanceolate, 2j" long, rough on the keel and sides, acute; pak(C 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, nearlv as long as the flower. — 

 Penn Yan, N. Y. Surtxodl. Aug. 



Tribe 3. PIILiCOIDE^. — Infloresence in dense, cylimhic or unilateral 

 spikes. Spikelets l-flowcrcd. Glumes 2, of nearly similar texture with the 

 paler. 



11. ALOPECDRUS. 



Glumes subcqual, connate, distinct ; palca? united into an inflated 

 glume, cleft on one .'^ido ludow the middle. gen<'ra)ly awned . Ftyle^ 

 often connate. 



