ORDER cxLiL— <i;ra:\il\ac'i:.e. r)S3 



5. A. spicifor'mis, (Ell.) Slem erect, simple, compressed. Lfavet 



linear; sheaths ghibi'ous. Flowers in compound racc-nu-s, apprt-ssed 

 Glumes shorter than the palcte, terii)iiiated by awns. Palar une<jual» 

 exterior one 3-awncd, with the intermediate one Iont,'est, pubescent at 

 the base. — U- Sept. — Oct. Pine-barrens. 1—3 feet. 



Tribe V.— AGROSTI'DE.E. 

 Spikelets 1-llowcred. 



Genus XVIL— MUHLENBER'GIA. Schrcb. 

 (In honor of Dr. Muhlenberg.) 



Glumes 2, very minute, fringed. Falece ovate, gibbous, nuich 

 larger than the glumes, the lower one uwned. Panicle simi)le. 



1. M. DiFFu'sA, (Willd.) Ste))i decumbent, geniculate, diffii.se, com- 

 pressed. Leaves linear, scabrous. Panicle slender, composed of alter- 

 nate, appressed racemes. Glumes unequal, small. Paleoe unecjual, 

 pubescent at the base, the exterior 3-nerved; awn purple. — U- Jul}-. 

 In fields. 18—20 inches. 



2. M. polypo'gox, (Trin.) Zeavc? convolute, glaucous. Pedicels ciovrd- 

 ed ; awn longer than the floret ; glumes awned at the ape.x. — Carolina. 



3. M. capilla'ris, (Trin.) Leaves convolute, long, glaucous. Flowers 

 crowded ; paleae 3 times as long as the glumes; awns naked. 



4. M. euec'ta, (Pursh.) Stem erect, simple, pubescent. Leaves pu- 

 bescent; sheath shorter than the joint, hairy at the throat. Panicle 

 loose. Glumes 2, with one very minute. Palcie with the e.\terior one 

 bearing a long awn, many-nerved. — U- July. Rocky hills. 2 — 3 ft. 



Genus XVIII.— AGROS'TIS. L. 

 (From agros, a field; tho place of growth.) 



Glume naked, beardle.s.s, 2-valved, 1-tlowered ; valve.s longer 

 than the paleaa. Falece 2, membranaceous. Sti'jmas longiiu-. 

 dinally hispid. 



1. A. Dis'PAR, (Mich.) Erect, large. Panicle loose, manv tlowered, 

 somewhat verticillate and pyramidal ; the e.xterior glume tlie largest^ 

 one of the interior very small. — Low country. 



2. A. laxiflo'ra, (Rich.) {Trichodium laxiflorum, Mich.) Stan erect, 

 glabrous. Leaves setaceous, scabrous. Pauiclts dilFuse, capillary, with 

 trichotomous branches. Glumes unequal, lanceolate, acute. J'olrte 

 shorter than the glumes, with the maigins pubescent. — If. Mnrch — 

 May. Dry fields or swamps. 18 inches to 3 feet. 



3. A. TRicnoPo'nE.s, (Ell.) Stein erect, glabrou.s. leaves flat, s.-a- 

 brous ; sheath glabrous, with long stipules. Panicle diffuse. J'fdun 

 cles capillary, long. Glumes much shorter than the paloic ; tl»e exterii»r 

 ))alea with a short, straight awn, the interior longest. — U- Sept.— 

 Oct. Common. 2 — 3 feet. 



4. A. arachnoi'des, (Ell.) (Cinna arachnoidea, Kunth.) Stem erect, 

 slender, glabrous. Leaves with the sheath as long as the jointn. Sltp^ 



