MANUAL OF THE GRASSES OF THE UNITED STATES 



329 



Figure 654.— Distribution of 

 Agrostis spica-venti. 



Figure 656.— Distribution of 

 Agrostis thurberiana . 



5. Agrostis aequivalvis (Trin.) Trin. (Fig. 657.) Similar to 

 A. thurberiana; culms on the average taller, blades longer; panicle 

 usually purple, 5 to 15 cm long; spikelets about 3 to 4.5 mm long; 

 palea nearly as long as the lemma; prolongation 

 of the rachilla minutely pubescent, one fifth to 

 half as long as the lemma. % — Wet mead- 

 ows and bogs, Alaska, southward (rare) in the 

 Cascade Mountains to Oregon. 



6. Agrostis verticillata Yill. Water bent. 

 (Fig. 658.) Culms usually decumbent at base, 

 sometimes with long creeping and rooting 

 stolons; blades firm, mostly relatively short 

 and broad, but in luxuriant specimens elongate; panicle contracted, 

 3 to 10 cm long, densely flowered, lobed with short verticillate 



branches, especially at base, the branches spike- 

 let-bearing from the base; spikelets usually 

 falling entire; glumes equal, narrowed to an 

 obtuse tip, scabrous on 

 back and keel, 2 mm long; 

 lemma 1 mm long, awn- 

 less, truncate and toothed 

 at apex; palea nearly as 

 long as the lemma. 21 — 

 Moist ground at low 

 altitudes, especially along 

 irrigation ditches (in irri- 

 figure ^.-Agroms tkurbe- gated regions), Texas to California, north to 

 nana. Panicle, x i; glumes southern Utah and Washington; on ballast at 

 and floret, x 5. (Type.) gome Atlantic ports introduced in America, 



south through the drier parts to Argentina (fig. 659) ; warmer parts 



of the Eastern Hemisphere. 



7. Agrostis stolonifera L. (Fig. 660.) 

 Culms ascending from a spreading base, the 

 decumbent portion rooting 

 in wet soil, 20 to 50 cm tall; 

 ligule as much as 6 mm 

 long; blades flat, mostly 1 

 to 3 mm wide; panicle 

 oblong, 5 to 15 cm long, pale 

 or purple, somewhat open, 

 the branches or some of 

 them spikelet-bearing from 

 near the base; spikelets 2 

 to 2.5 mm long; glumes 

 acute, glabrous except the 

 scabrous keel; lemma short- 

 er than the glumes, awnleSS Figure 658.— Agrostis 

 ■, ip j.v rerlicillaln. Panicle, 



or rarely awned irom tne x i; eiumes and 

 back; palea usually half to JgjXf G ggo» 



Figure 657.— Agrostis aequivalvis. tWO thirds as long as the 



^HSWdi^iftrSSi.) " 1 ' X lemma. % -Moist grassy places, New- 

 foundland to Alaska, south to New Jersey 

 in the East and to Oregon in the West (fig. 661); northern Europe. 

 This species appears to be native in northern North America. 



