94 TRIANDRIA. DTGYNIA. arijndo. 



II. p. 507. A. cinnoides Muhl. Gram. p. 187. A. os;ros- 

 toides Pursh Fl. I. p. 86. Calamagrostis mexican& 

 Null, Gen. I. p. 46. excl. sjn. P ers. 



Boot perennial, fibrous. Culm 3 feet or more in height, simple, 

 or rarely branched below. Leaves a foot long, abuin 3 lines 

 wide, flat, somewhat glaucous, strongly nerved, pubescent 

 above, smooth beneath. Sheaths clasping; the lowest ones 

 pubescent backwards. Sri/iule elongated, lacerate. Panicle 

 erect, much divided, at first contracted, but at length a little 

 expanding; branches aggregated in fours or fives, scabrous. 

 Calyx rather longer than the corolla ; glumes nearly equal, 

 lanceolate, acute, 1 -nerved, scabrous, particularly on the keel; 

 sides tinged ol a purplish colour. Corolla unequal ; inferior 

 valve longer, bifid at the apex, avvped a little below the middle 

 of the back; awn projecting beyond the flower; superior 

 valve rather obtuse, entire. Pofifius copious, white, partly 

 siipitale, as if the rudiment of an abortive flower. Sted pubes- 

 cent {Mu h l.) Scamens 3 ; anthers yellow. Sdgmas plu- 

 mose. 



Hab. In swamps and bog-meadows. Frequent on the small 

 rivers which empty into tiie Hudson. Wiliiamstown, Massa- 

 chusetts. Benuey. Deerfield, Massachusetts, Cooley^ 

 August. 



2. A. coarctata^': poniclo somewhat spiked, conglomer- 

 ate ; calyx a little longer than the corolla, carinate ; corolla 

 longer than the pappus, awned a little below the tip. Agros- 

 Tis glauca Muhl. Gram. p. 76. t Calamagrostis canadeyi- 

 sis JST u n. Gen. L p. 46. excl. syn. M ich. Arundo strir.la 

 Spreng. JVtue Entdeck. I. p. 247. excl. syu. Timm. et 

 Ell. 



Hoot perennial. Culm 3—5 feet high, erect, terete, somewhat 

 glaucous. Leaves broad-linear, scabrous, and with the sheaths 

 a little glaucous. Sii/iule oblong, obluse. Panicle stiffly erect, 

 never spreading ; branches aggregated. Calyx nearly equal, 

 lanceolate, acuminate; the interior glume 1 -nerved; the su- 

 perior 3-nerved ; keel scabrous. Valves of the corolla nearly- 

 equal ; the inferior scabrous, 5-nerved, bifid at the apex ; 

 anvn straight, not half the length of the valve ; superior valve 

 bicarinate, a little cleft at the apex. Pafipus two-thirds the 

 length of the flower, partly stipitate at the base of the su- 

 perior valve. Seed villous, with a hairy tuft at the extremity. 



•j- 1 have not adopted the specific name of Muhlenberg, as there is 

 »n AncNDO glauca described by JJo me ma n, wbich is probably distinct 

 from the present species. The following are its characters : — " A. pani- 

 culd subpalente cerniia, cah/ctbus acmuinatis, pilis corollam excedenlibus, 

 arista terminali recta, calycem excedente. Folia linearia, apice setacea, con- 

 voluta, cum culiiio glauco, Hab. In Amcr. Septentrional." Raem. & 

 iichult. II. p. 503. 



