MANUAL OF THE GRASSES OF THE UNITED STATES 



329 



Figuke 654.— Distribution of 

 Agrostis spica-venti. 



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 Vill. 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. 2[ — 

 Moist ground at low 



oltitnriPQ psmppiallv nlnncr Figure 656.— Distribution of 

 altitudes, especially along Agrostis thurberiana. 



irrigation ditches (m rrri- 



TiGv*E(>o5.-AgTostisthurbe- gated regions), Texas to California, north to 



ria dfl Panicle -' x ^g lunies southern Utah and Washington; on ballast at 



some Atlantic ports. Introduced in ximerica, 



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-b earing 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.— Agros, 

 or rarely awned from the T*ff%*E al £& 

 back; palea usually half to fX^cIit) ™' 

 two thirds as long as the 

 lemma. '21 —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. 



Figure 657.— Agrostis aequivalvis. 

 Panicle, X 1; glumes and floret. X 

 5. (Howell 1712, Alaska.) 



