1. Panicularia Laxa Scribn. Northern Manna-Grass

Fig. 632

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 1/2"-1" long; blades 8'-15' long, 2"-4" wide, very rough; panicle 7'-9' in length, the branches spreading or ascending, the lower 3'-6' long; spikelets 3-5-flowered, about 2" long; empty scales unequal, scarious, acute, 1-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. Nova Scotia to Maine, New Jersey and Pennsylvania. Aug.

2. Panicularia Canadensis (Michx.) Kuntze. Rattlesnake-Grass

Fig. 633

Briza canadensis Michx. Fl. Bor. Am. 1:71. 1803. Glyceria canadensis Trin. Mem. Acad. St. Petersb. (VI.)

1: 366. 1831. Panicularia canadensis Kuntze, Rev. Gen. PI. 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; blades 6'-1° long or more, 2"-4" wide, rough; panicle 5 1/2'-10' in length, the branches spreading, ascending or often drooping, 2Y-5' long; spikelets 5-12-flowered, 2 1/2"-4" long, flattened, turgid; empty scales unequal, acute, 1-nerved; flowering scales, broad, 1 1/2"-2" long, obtuse or acutish,. obscurely 7-nerved.

In swamps and marshes, Newfoundland to Minnesota, south to New Jersey and Kansas. The handsomest species of the genus. Ascends to 5000 ft. in the Adirondacks. Tall Quaking-grass. July-Aug.

3. Panicularia Obtusa (Muhl.) Kuntze. Blunt Manna-Grass

Fig. 634

Poa obtusa Muhl. Gram. 147. 1817.

Glyceria obtusa Trin. Mem. Acad. St. Petersb. (VI.) 1: 366.

1831. Panicularia obtusa Kuntze, Rev. Gen. PI. 783. 1891.

Culms 1°-3° tall, erect, simple, smooth and glabrous. Sheaths sometimes rough, strongly striate, the lower overlapping; ligule very short; blades 6'-15' long, 2"-4" wide, usually stiff, erect or ascending, smooth beneath, more or less scabrous above; panicle 3'-8' in length, contracted, dense, the branches erect; spikelets 3-7-flow-ered, 2"-3" long; empty scales acute, scarious, 1-nerved; flowering scales about 1 1/2" long, broad, obtuse, obscurely 7-nerved.

In swamps, Nova Scotia and New Brunswick to New York and central Pennsylvania, south to Maryland and North Carolina (according to Kearney). Ascends to 2300 ft. in the Catskill Mountains. July-Aug.

4. Panicularia Torreyana (Spreng.) Merrill. Long Manna-Grass

Fig. 635

Poa elongata Torr. Fl. U. S. 1: 112. 1824. Not Willd. 1809.

P. Torreyana Spreng. Neue Entdeck. 2: 104. 1821.

Glyceria elongata Trin. Bull. Acad. Sci. St. Petersb. 1: 68. 1836.

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

P. Torreyana Merrill, Rhodora 4: 146. 1902.

Glyceria Torreyana Hitchc. Rhodora 8: 211. 1906.

Culms 2°-3° tall, erect. Sheaths often shorter than the internodes; blades lax, 6-12' long,1 1/2"-3" wide, long-acuminate, smooth beneath, rough above; panicle elongated, contracted, narrow, usually nodding at the summit, 6'-12' in length, the branches erect or appressed, 1'-2 1/2'long; spikelets 3-4-flowered, 1 1/2"-2" long; empty scales unequal, acute, 1-nerved; flowering scales narrow, about 1" long, obtuse or acutish, 7-nerved.

In wet woods, Maine and Quebec to Minnesota, south to North Carolina and Kentucky. Ascends to 4000 ft. in the Adirondacks. Aug.-Sept.