HOW TO KNOW THE GRASSES 



67a. Lemmas about 3.5 mm. long; panicle dense, oblong, about 15 cm. 

 or less long. Fig. 100. 



Glyceria obtusa (Muhl.) Trin. 



Perennial; culms erect or decumbent, 

 50 — 100 cm. tall; leaf blades flat or fold- 

 ed; 2 — 6 mm. wide; spikelets with 4 — 7 

 florets, 4 — 7 mm. long. Glyceria ohtusa 

 is a characteristic grass of the bogs of 

 the Atlantic Coastal Plain, and found 

 nowhere else. August — September. 



Figure 100 



67b. Lemmas 2.0 — 2.7 mm. long; panicle slender, 15 — 36 cm. long. 

 Fig. 101. 



Glyceria melicaria (Michx.) F. T. Hubb. 



Perennial; culms in small tufts, 60 — 

 100 cm. tall; leaf blades long and nar- 

 row, rough, 2 — 5 mm. wide; spikelets 

 with 3 — 4 florets, about 4 mm. long. The 

 slender, arching culms of this species 

 fringe woodland streams and puddles. 

 July — August. 



Figure 101 



68a. Spikelets oblong or ovate, mostly less than 2 mm. wide; lemmas 

 thin, with conspicuous nerves 69 



54 



