HOW TO KNOW THE GRASSES 



TRIBE IV. AVENEAE 



la. Spikelets disarticulating above the glumes 2 



lb. Spikelets disarticulating below the glumes, 



12 



2a. Lemmas with 9 awns each. . . .See Fig. 41 (Enneapogon desvauxu)» 



2b. Lemmas with a single awn 3 



3a. Spikelets (excluding awns) 9 mm. long or shorter 4 



3b. Spikelets over 1 cm. long. 



10 



4a. Lemmas bearing an awn on the back (or if awnless, with slender 

 hairy rachilla joints) 5 



4b. Lemmas awnless or with a very short awn arising at the split tip 

 of the lemma; rachilla joints very short. Fig. 178. 



JUNEGRASS Koeleria cristata (L.) Pers. 



Perennial; tufted; culms 30 — 60 cm. tall; 

 panicles yellowish or silvery in color, nar- 

 rowly cylindrical or somewhat lobed. At 

 blooming time the branches spread but 

 later close up again. Spikelets with 2 — 4 

 florets. Junegrass is one of the most wide- 

 ly distributed of American grasses. Dry 

 or sandy soil; prairies or open woods. Also 

 found in Eurasia. June — September. 



Figure 178 



5a. All florets alike and perfect; spikelets 2 — 6 mm. long 6 



95 



