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— 4f high ; Ivs. involute, If by J', 

 smooth and glaucous, pungently acute; slieaUis smooth; stip. oblong; panicle 

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

 compressed, greenish-white ; lotvcr palecc 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 an^ti4ST0stis. 



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

 palege 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 — 5f high ; Ivs. 



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

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

 acute, smoothish, much longer than the palese ; lower palea bifid at the apex, 

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

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



2. C. coARCTATA. Torr. f Agrostis glauca. Muhl. Arimdo stricta, i^.) 

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



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

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

 lanceolate,lower 1-veined, upper 3-veined ; lozvcr palea 5-vemed, bifid at the 

 apex, with a short, straight awn a little below the tip. — 9;}. 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 paleae ; pappus very short, not half the length of the paleae. — %. In 

 sandy swamps, N. J., Torrey. 



4. C. PORPURAscENs. Brown. (C. sylvatica. THn.) 



Panicle spicate ; ghtmcs scaBrous ; palece 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., Thickerman. Rocky Mts., Ric/t^ 

 ardson. — Very rare and unimportant. 



5. C. iNEXPANSA. Gray. 



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

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

 lanceolate, 2i" long, rough on the keel and sides, acute ; palece nearly equa*, 

 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. PHL/EOIDEJE. — Infloresence in dense, cylindric or unilateral 

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



14. ALOPECCtRUS. 

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

 glume, cleft on one side below t^ie middle, generally awned j styles 

 often connate. 



