84 



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







Figure 88. — Glyceria borealis. Panicle, X 1; floret, 

 X 10. (Fernald 193, Elaine.) 



Figure 89. — Glyceria leptostachya. Panicle, 

 floret, X 10. (Heller 5606, Calif.) 



X 1; 



on the upper surface. 4 to 7 mm. 

 rarely to 1 cm. wide; panicle 20 to 

 40 cm. long, the branches ascending. 



mostly in twos or threes, several-flow- 

 ered, often bearing secondary branch- 



- -pikelets 1 to 2 cm. long, 8- to 14- 

 flowered, often purplish; glumes 1.5 

 and 3 mm. long; lemmas firm, broadly 

 rounded toward apex, about 3 mm. 

 long, 7-nerved, scaberulous on the 

 nerves and between them. % 

 (Panicularia davyi Merr.) — Shallow 

 water, up to 1,200 m., rare, "Washing- 

 ton to central California. 



4. Glyceria arkansana Fernald. 

 (Fig. 90.) Resembling G. septentrio- 

 ?i alis: first glume 2 to 2.5 mm. long; 

 lemmas 3 to 3.5 mm. long, hirtellous 

 rather than scaberulous. % — "Wet 

 ground, Louisiana and Arkansas. 9 



all 



M- ■ I i '.V 



■ mm v y bi 



Figure 90. — Glyceria arkansana. Panicle, X 1: floret, 

 X 10. (Ball 362, U 



5. Glyceria septentrionalis Hitchc. 

 Eastern mannagrass. (Fig. 91.) 

 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 cm. long. 6- to 12- 



9 A specimen labeled ''Western part of 

 New-York," 1S40, mav have a misplaced 

 label. 



