GRASS FAMILY. 2I , 



i. Panicularia laxa Scribn. Northern Manna-grass. (Fig. 484.) 



Panicularia laxa Scribn. Bull. Torr. Club, 21: 37. 1894. 



Glyceria laxa Scribn. ; Redf. & Rand, Fl. Mt. Desert 

 180. 1894. 



Culms 2-4 tall, erect, simple, smooth or slightly 

 scabrous. Sheaths overlapping, rough ; liguU- 

 ^ // -i // long; leaves 8 / -i5 / long, 2 // -4 // wide, very 

 rough; panicle 7 / -o/ in length, the branches spread- 

 ing or ascending, the lower $'-6' long; spikelets 3- 

 5-flowered, about 2" long; empty scales unequal, 

 scarious, acute, i-nerved, the first one-half to two- 

 thirds the length of the second; flowering scales 

 broad, about \" long, twice the length of the second 

 scale, obtuse, obscurely y-nerved. 



In water or wet soil, Maine to Pennsylvania. Aug. 



2. Panicularia Canadensis (Michx.) Kuntze. 



(Fig- 485.) 



Rattlesnake Grass. 



Rriza Canadensis Michx. Fl. Hur. Am i 71 iStoj. 

 Glyceria CanadensisTrin. Mem. A cad. St I'ctcr-! 



1:366. 1831. 

 Panicularia Canadensis Kuntze, Rev. Gen. PI. 783. 1891. 



Culms 2-3 tall, em-t, simple, smooth or (lightly 

 scabrous. Sheaths shorter than the itiU-rnode*. tho*e 

 at the base of the culm overlapping; ligule I" long, 

 truncate; leaves 6'-i long or more, 2 "-4" wide, 

 rough; panicle s^'-ic/ in length, the branches 

 spreading, ascending or often drooping, Jja'-j' long; 

 spikelets 5-i2-flo\vered, 2*1" 4" 1<>"J?, flattened, tur- 

 gid; empty scales unequal, acute, i-nerved; flower- 

 ing scales, broad, i '."--2" long, obtuse or mcutuh. 

 obscurely 7-nerved. 



In swamps and marshes, Newfoundland an! 

 Brunswick to Ontario and Minm- >ta. tith ! New Jer- 

 sey, Ohio and Kansas. Tht h.m.l-*>mc*t specie* of tor 

 genus. Ascends to 5000 ft. in the Adirondack*. July Auj 



3. Panicularia obtusa (Muhl.) Kuntze. Blunt Manna-grass. (Fig. 486.) 



Poa obtusa Muhl. Gram. 147. 1817. 



Glyceria obtusa Trin. Mem. Acad. St. Petersb. (VI.) i: 

 366. 1831. 



Panicularia obtusa Kuntze, Rev. Gen. PI. 783. 1891. 



Culms i-3 tall, erect, simple, smooth and glabrous. 

 Sheaths sometimes rough, strongly striate, the lower 

 overlapping; ligule very short; leaves 6 / -i5 / long, 2"- 

 4" wide, usually stiff, erect or ascending, smooth be- 

 neath, more or less scabrous above; panicle $'-&' in 

 length, contracted, dense, the branches erect; spikelets 

 3-7-flowered, 2 // ~3 // long; empty scales acute, scari- 

 ous, i-nerved; flowering scales about i%" long, broad, 

 obtuse, obscurely 7-nerved. 



In swamps, New Brunswick to New York and central 

 Pennsylvania, south to Delaware and Maryland. Ascends 

 to 2300 ft. in the Catskill Mountains. July-Aug. 



