MANUAL OF THE GRASSES OF THE UNITED STATES 



89 





10. Glyceria obtusa (Muhl.) Triii. (Fig. 139.) Culms erect, often 

 decumbent at base, 50 to 100 cm tall, rather firm; blades elongate, 

 erect, mostly smooth, flat or folded, 2 to 6 mm wide; panicle erect, 

 oblong or narrowly elliptic, dense, 5 to 15 cm long, the 

 branches ascending or appressed; spikelets mostly 4- to 

 7-flowered, 4 to 6 mm long, 

 green or tawny, the rachilla 

 joints very short; glumes broad, 

 scarious, 1.5 and 2 mm long; 

 lemmas firm, faintly nerved, 

 smooth, 3 to 4 mm long, obtuse, 

 the scarious tip narrow, often 

 re volute. 01 (Panicularia obtusa 

 Kuntze.) — Bogs and marshy 

 places, Nova Scotia to North 

 Carolina, near the coast (fig. 

 140). 



11. Glyceria melicaria 

 (Michx.) F. T. Hubb. (Fig. 

 141.) Culms slender, solitary 

 or few, 60 to 100 cm tall; blades 

 elongate, scaberulous, 2 to 5 mm 

 wide; panicle narrow but rather 

 loose, nodding, 15 to 25 cm long, 

 the branches erect, rather dis- 

 tant; spikelets 3- or 4-flowered, 

 about 4 mm long, green ; glumes 

 about 1.5 and 2 mm long, acut- 

 ish; lemmas firm, 2 to 2.5 mm 

 long, acutish, smooth, the nerves 

 rather faint. 01 (G. torreyana 

 Hitchc; Panicularia torreyana Merr.; P. 

 melicaria Hitchc.) — Swamps and wet woods, 

 New Brunswick to Ohio, south to the 

 mountains of North Carolina (fig. 142). 



12. Glyceria canadensis (Michx.) Trin. 

 Rattlesnake mannagrass. (Fig. 143.) 

 Culms erect, solitary or few in a tuft, 60 to 

 150 cm tall; blades scabrous, 3 to 7 mm 

 wide; panicle open, 15 to 20 cm long, nearly as wide, the branches 

 rather distant, drooping, naked below; spikelets ovate or oblong, 5- to 



10-flowered, 5 to 6 mm long, the florets crowded, 

 spreading; glumes about 2 and 3 mm long; 

 lemmas 3 to 4 mm long, the 7 nerves obscured 

 in the firm tissue of the lemma; palea bowed 

 out on the keels, the floret somewhat tumid. 

 01 (Panicularia canadensis Kuntze.) — Bogs 

 and wet places, Newfoundland to Minnesota, 

 south to Maryland and Illinois (fig. 144). 

 Glyceria canadensis var. laxa (Scribn.) 

 Hitchc. On the average taller, with looser panicles of somewhat 

 smaller 3- to 5-flowered spikelets. 01 (Panicularia laxa Scribn.) — 

 Wet places, Nova Scotia to New York, Maryland, and West Virginia; 

 Michigan. 



111! 



Figure 138 — 

 Glyceria erecta. 

 Panicle, X 1; 

 floret, X 10. 

 (Hitchcock 

 3059, Oreg.) 



Figure 139.— Glyceria obtusa. Pan 

 icle, X 1; 2 views of floret, X 10. 

 (Miller, N.Y.) 



Figure 140.— Distribution of 

 Glyceria obtusa. 



