GRASS FAMILY. 205 
1. 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; ligule 
¥%4//-1’" long; leaves 8/-15/ long, 2’/-4/” wide, very 
rough; panicle 7/9’ in length, the branches spread- 
ing or ascending, the lower 3/6’ 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 1’ long, twice the length of the second 
scale, obtuse, obscurely 7-nerved. 
In water or wet soil, Maine to Pennsylvania. Aug. 
2. Panicularia Canadénsis (Michx.) Kuntze. Rattlesnake Grass. 
(Fig. 485.) 
Briza Canadensis Michx. Fl. Bor. Am. 1:71. 1803. 
Glyceria Canadensis Trin, Mem. Acad. St. Petersb. (VI.) 
I: 366. 1831. 
Panicularia Canadensis Kuntze, Rev. Gen. Pl, 783. 1891. 
Culms 2°-3° tall, erect, simple, smooth or slightly 
scabrous. Sheaths shorter than the internodes, those 
at the base of the culm overlapping; ligule 1/’ long, 
truncate; leaves 6/-1° long or more, 2//-4/’ wide, 
rough; panicle 5%%/’-10’ in length, the branches 
spreading, ascending or often drooping, 2'%’-5/ long; 
spikelets 5-12-flowered, 213’’-4’’ long, flattened, tur- 
gid; empty scales unequal, acute, 1-nerved; flower- 
ing scales, broad, 1'4//-2/’ long, obtuse or acutish, 
obscurely 7-nerved. 
In swamps and marshes, Newfoundland and New 
Brunswick to Ontario and Minnesota, south to New Jer- 
sey, Ohio and Kansas. The handsomest species of the 
genus. Ascends to 5000ft. in the Adirondacks. July—Aug. 
3. Panicularia obtusa (Muhl.) Kuntze. Blunt Manna-grass. (Fig. 486.) 
Poa obtusa Muhl. Gram. 147. 1817. 
Glyceria obtusa Trin. Mem. Acad. St. Petersb. (VI.) 1: 
366. 1831. 
Panicularia obtusa Kuntze, Rev. Gen. Pl. 783. 1891. 
Culms 1°-3° tall, erect, simple, smooth and glabrous. 
Sheaths sometimes rough, strongly striate, the lower 
overlapping; ligule very short; leaves 6’—15/ long, 2//— 
4/’ wide, usually stiff, erect or ascending, smooth be- 
neath, more or less scabrous above; panicle 3/—8’ in 
length, contracted, dense, the branches erect; spikelets 
3-7-flowered, 2//-3/’ long; empty scales acute, scari- 
ous, I-nerved; flowering scales about 114’’ 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. 
