266 



GRAMINEAE. 



VOL. I. 



g. Panicularia borealis Xash. Northern 

 Manna-grass. Fig. 640. 



Glyceria fluitans var. angustata Vasey, Proc. Port. 



Soc. Nat. Hist. 2: 91. 1895. Not G. angustata T. 



Fries, 1869. 



P. borealis Nash, Bull. Torr. Club, 24: 348. 1897. 

 Glyceria borealis Batch. Proc. Manch. Inst. i : 74. 



1900. 



Glabrous. Culms erect from a creeping base, 

 ii-5tall; sheaths overlapping, smooth or rough- 

 ish, the uppermost one enclosing the base of the 

 panicle; ligule 2\"-7\" long, membranous; blades 

 linear, abruptly acuminate, 3*'-2i' long, i"-s" 

 wide ; panicle slender, narrow, the exserted por- 

 tion 6'-2o' long, its branches appressed or nearly 

 so, the lower in 2*s of 3's, the longer of which 

 bear 5-12 spikelets ; spikelets 5"-g" long, 7-13- 

 flowered, appressed ; outer two scales empty, 

 i-nerved, smooth and shining, unequal; flower- 

 ing scales thin, 2"-2i" long, 7-neryed, the nerves 

 hispidulous, a broad scarious margin at the obtuse 

 and erose apex; palet hyaline, shortly 2-toothed 

 at the obtuse apex. 



In shallow water, Newfoundland to Alaska, south 

 to New York, Minnesota, Iowa and Oregon, and in 

 the mountains to Colorado. June-Aug. 



10. Panicularia fluitans (L.) Kuntze. Float- 

 ing Manna-grass. Sweet-grass. Fig. 641. 



Fcstuca fluitans L. Sp. PI. 75. 1753. 



Glyceria fluitans R. Br. Prod, i: 179. 1810. 



P. fluitans Kuntze, Rev. Gen. 782. 1891. 



P. brachyphylla Nash, Bull. Torr. Club 24: 349. 1897. 



Culms erect from a creeping base, 2-3 tall ; 

 sheaths generally longer than the internodes, almost 

 closed, the uppermost one enclosing the base of the 

 panicle; blades linear, acuminate, 2$'-$' long, 2"-22" 

 wide ; panicle slender, its branches appressed or nearly 

 so, the lower in 2*s or 3's, the longer of which bear 

 2 or 3 spikelets ; spikelets compressed-cylindric, 10"- 

 14" long, 7-i2-flowered ; flowering scales hispidulous 

 all over, 7-nerved, about 2\" long, the obtuse apex 

 obscurely and irregularly few-toothed ; palet acumi- 

 nate, a little exceeding the scale. 



In shallow water, Gulf of St. Lawrence and near New 

 York City. Perhaps introduced. Common in Europe. 

 Flote-grass, Russia-grass, Manna Croup-grass, Poland 

 Manna. June-July. 



ii. Panicularia acutiflora (Torr.) Kuntze. 

 Sharp-scaled Manna-grass. Fig. 642. 



Glyceria acutiflora Torr. Fl. U. S. i : 104. 1824. 

 Panicularia acutiflora Kuntze, Rev. Gen. PI. 782. 1891. 



Culms i-2 tall, flattened, erect from a decumbent 

 base, simple, smooth and glabrous. Sheaths loose, 

 generally a little exceeding the internodes, smooth and 

 glabrous ; ligule 2" long, truncate ; blades 3'-6' long, 

 2"-3" wide, smooth beneath, rough above ; panicle 6'-i2' 

 in length, the branches erect or appressed, 2'-4' long; 

 spikelets linear, 5-12-flowered, i'-if' long; empty scales 

 acute, smooth ; flowering scales about 4" long, lanceo- 

 late, acute, scabrous, exceeded by the long-acuminate 

 palets. 



In wet places, Maine to Delaware and Ohio. June-Aug. 



