86 



MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



Figure 128.— Distribution of 

 Glycerin borealis. 



wider; panicle mostly 20 to 40 cm long, the branches as much as 10 

 cm long, bearing several appressed spikelets; spikelets mostly 6- to 

 12-nowered, 1 to 1.5 cm long; glumes about 1.5 and 3 mm long; 

 lemmas rather thin, obtuse, 3 to 4 mm long, 

 strongly 7-nerved, scarious at the tip, glabrous 

 between the hispidulous nerves. % (Panic- 

 ularia borealis Nash.) — Wet places and shallow 

 water, Newfoundland to southeast Alaska, 

 south to Connecticut, northwestern Indiana, 

 Iowa, South Dakota, and in the mountains 

 to New Mexico and central California (fig. 

 128). 



3. Glyceria leptostachya Buckl. (Fig. 129.) Culms 1 to 1.5 m 

 tall, rather stout or succulent; sheaths slightly rough; blades flat, 

 scaberulous on the upper surface, 4 to 7 mm wide, rarely 1 cm wide; 

 panicle 20 to 40 cm long, the branches ascending, 

 mostly in 2's or 3 's, several- 

 flowered, often bearing sec- 

 ondary branchlets; spikelets 

 1 to 2 cm long, 8- to 14- 

 flowered, often purplish; 

 glumes 1.5 and 3 mm long; 

 lemmas firm, broadly round- 

 ed toward apex, about 3 

 mm long, 7-nerved, scaberu- 

 lous on the nerves and be- 

 tween them. % (Panicu- 

 laria davyi Merr.) — Shallow 

 water, up to 1,200 m, rare, 

 Washington to central Cali- 

 fornia. 



4. Glyceria arkansana 

 Fernald. (Fig. 130.) Re- 

 i sembling G. septentrionalis; 

 first glume 2 to 2.5 mm long; 

 lemmas 3 mm long, hirtel- 

 lous rather than scaberulous. 

 % Wet ground, Louisiana, 

 floret, x id. "(Heiier 5606; Arkansas, and Texas (fide 



Fernald). There is a specimen labeled "western 

 New York"; this locality should be confirmed. 



5. Glyceria septentrionalis Hitckc. Eastern mannagrass. (Fig. 

 131.) Culms 1 to 1.5 m tall, somewhat succulent; sheaths smooth; 

 blades flat, mostly 10 to 20 cm long, 4 to 8 mm wide, usually 

 smooth beneath, slightly scaberulous on the upper surface and margin; 

 panicle 20 to 40 cm long, somewhat open, the branches as much as 10 

 cm long, several-flowered, often spreading at anthesis; spikelets 1 to 2 



Figure 129.— Glyceria lepto- 

 stachya. Panicle, X 1 



Figure 130. — Glyceria arkan- 

 sana. Panicle, X 1; floret, X 

 10. (Ball 362, La.) 



