Alopeclrus. CLXI. GRAMINEtE. 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.) Mai Grass. 



Rt. creeping extensively ; st. erect, rigid, 2 — 4fhigh; ^rs. involute, Ifby i', 

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

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

 compressed, greenish-white ; Icnccr palca 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 Agrostis. 



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

 pale^ 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. PA. Arundo. 

 Michx.) Reed Grass. Blue-joint. — St. smooth, erect, rigid, 3— 5t' high ; Ivs. 



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

 loose, oblong, the branches capillar}', aggregated in 4s and 5s; glumes very 

 acute, smoothish, much longer than the paleas ; Imcer falccc bifid at the apex, 

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

 groimds, N. Eng. W. to Mich. Makes good hay. Conamon. Aug. 



2. C. COARGTATA. Torr. (Agrostis glauca. Muhl. Arundo stricta. Spr.) 

 Glaucous ; St. erect, 2— 4f high ; Ivs. 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 ; glunics acuminate, 

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

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

 Brit. Am. July, Aug. 



3. C. BREviPiLis. Torr. (A. Epigeios. Muhi:) 



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

 panicle pyramidal, loose, with the difiuse, 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 palete.— IL In 

 sandy swamps, N. J., Torrey. 



4. C. PURPURASCENS. Brown. (C. svlvatica. Trin.) 



Panicle spicate ; glumes scabrous ; palea 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., Tuckerman. Rocky Mts., Rich- 

 ardson. — Very rare and unimportant. 



5. C. iNEXPANSA. Gra5^ 



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

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

 lanceolate 2A" long, rough on the keel and sides, acute ; palecc 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. Sartiocll. Aug. 



Tribe 3. PHL,EOIDEJ3.— Infloresence in dense, cylindric or unilateral 

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



14. ALOPECiJRUS. 

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

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

 often connate. 



