94 



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



Figure 151. — Distribution of 

 Glycena pallida. 



Dome, Great Smoky Mountains, Tenn. A rare and apparently 

 distinct species based upon fragmentary material. More specimens 



0X6 11660.60. 



17. Glyceria pallida (Torr.) Trim (Fig. 

 150.) Culms slender, lax, ascending from a 

 decumbent rooting base, 30 to 100 cm long; 

 blades mostly 4 to 8 mm wide; panicle pale 

 green, open, 5 to 15 cm long, the branches 

 ascending, flexuous, finally more or less spread- 

 ing; spikelets somewhat elliptic, 4- to 7- 



flowered, 6 to 7 mm long; glumes 1.5 to 2 and 2 to 2.5 mm long; 



lemmas 2.5 to 3 mm long, scaberulous, obtuse, the scarious tip erose; 



anthers linear, about 1 mm long. % (Pan- 



icularia pallida Kuntze.) — Shallow cold water, 



Maine to Wisconsin, south to North Carolina 



and Missouri (fig. 151). Resembles species of 



Poa. 



18. Glyceria neogaea Steud. (Fig. 152.) 



Resembling G. pallida and appearing to grade 



into it; culm more slender, 20 to 40 cm long; 



blades 1 to 3 mm wide ; panicle on the average 



smaller, the branches finally spreading or re- 

 flexed; spikelets mostly 3- to 5-flowered, 4 to 



5 mm long; glumes and lemmas a little 



shorter than in G. pallida; anthers globose, 



0.2 to 0.5 mm long. % (G. fernaldii St. 



John.) — Shallow water, Newfoundland to 



Minnesota, south to Connecticut (fig. 153). 



7. SCLEROCHLOA Beauv. 



Spikelets 3-flowered, the upper floret ster- 

 ile; rachilla continuous broad, thick the Figure 152 __ 0[yceria neogaea . 

 spikelet falling entire; glumes broad, obtuse, Plant, x i; floret, x 10. 

 rather firm, with hyaline margins, the first gg"* Fernald ' and Pease '' 

 3-nerved, the second 7 -nerved ; lemmas rounded 



on the back, obtuse with 5 prominent parallel nerves and hyaline 

 margins; palea hyaline, sharply keeled. Low tufted annual, with 



broad upper sheaths, folded blades with boat- 

 shaped tips, and dense spikelike racemes, 

 the spikelets subsessile, imbricate in two rows 

 on one side of the broad thick rachis. Type 

 species, Sclerochloa dura. Name from Greek 

 skleros, hard, and chloa, grass, alluding to the 

 firm glumes. 



1. Sclerochloa dura (L.) Beauv. (Fig. 154.) 

 Culms erect to spreading, 2 to 7 cm long; foliage glabrous, the 

 lower leaves very small, the upper increasingly larger, with broad 

 overlapping sheaths; blades 7 to 18 mm long, 1 to 3 mm wide, 

 the upper exceeding the raceme, the junction with the sheath ob- 

 scure; raceme 1 to 2 cm long, nearly half as wide; spikelets 6 to 7 



Figure 153.— Distribution of 

 Glyceria neogaea. 



