88 



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



SECTION 2. HYDR6POA Dum. 



Spikelets more or less laterally compressed, ovate to oblong, usually 

 not more than 5 mm long; panicles open or condensed but not 

 long and narrow (except in G. melicaria). 



8. Glyceria pauci flora Presl. 

 WEAK MANNAGRASS. (Fig. 136.) 

 Culms 50 to 120 cm tall; sheaths 

 smooth or scaberulous; blades 

 thin, flat, lax, scaberulous, mostly 

 10 to 15 cm long, 5 to 15 nun 

 wide; panicle open or rather 

 dense, nodding, 10 to 20 cm long, 



FIGURE 135. Distribution of 

 Glyceria occidentalis. 



the branches ascending or spread- 

 ing, rather flexuous, the spikelets 

 crowded on the upper half, the 

 lowermost usually 2 to 4; spike- 

 lets mostly 5- or 6-flowered, 4 

 to 5 mm long, often purplish; 



FIGURE 134. Glyceria occidentalis. Panicle, X 1; _!. u 



floret, x 10. (Type.) glumes broadly ovate or oval, 



about 1 and 1.5 mm long, the 



margins erose-scarious ; lemmas oblong, about 2 mm long, with 5 

 prominent nerves and an outer short faint pair near the margins, 

 scaberulous on the nerves and somewhat so between them, the tip 

 rounded, scarious, somewhat erose. 

 91 (PaniculariapaucifloraKuutze.) 

 Shallow water, marshes and wet 

 meadows, Alaska to South Dakota, 



FIGURE 136. Glyceria pauciflora. Panicle, X 1: 



Hdtef and ^ 



FIGURE 137. Distribution of 

 Glyceria pauciflora. 



south to California and New Mexico, 

 rising in the mountains to timber line 



(fig. 137). 



9. Glyceria erecta Hitchc. (Fig. 

 138.) Differing from G. pauciflora 

 in the smaller size, mostly 30 to 40 cm tall, and in the narrow erect 

 panicles, 3 to 8 cm long, with ascending or appressed few-flowered 

 branches; lemmas about 3 mm long. 01 (Panicularia erecta 

 Hitchc.) Springy or boggy places, mostly near or above timber line, 

 Crater Lake, Oreg., to Mount Whitney, Calif., and Glenbrook, Nev. 

 Passes into the preceding species, of which it may be an alpine variety. 



