236 POACE^. 



c. Ligiile 3 mm. long, empty glumes 1.6-2 mm. long, floral 



glume 3 mm. long ^ 



c. Ligule 5-10 mm. long, empty glumes variable, floral 



glume 3.5 mm. loug '^ 



c. Ligule 10-12 mm. long, empty glumes 4-C mm. loug, 



floral glume 4 mm. loug ^ 



e. Ligule 10-18 mm. long, empty glumes 3.5-4 mm. long, 



floral glume 5-5.5 mm. long ^ 



c. Ligule 3-5 mm. long, empty glumes 1.5-3 mm. loug, 



floral glume 3 mm. long "^ 



D. Floral glume o-ncrved, -' mm. long (m) 



m. Ligule very short, floral glume 2 mm. long. . . .10^ 

 m. Ligule 5-7 mm. long, floral glume 13 mm. long. . .11 



E. Floml glume S-nerved and otherwise vnlike those above. . (e). 

 e. Floral glume 2 mm. or less in length (f) 



f. Floral glume about 1.5 mm. long, ligule a ring, 

 perennial ^'^ 



f. Floral glume about 1.5 mm. long, ligule 0.5 mm. 

 long, perennial ^'^ 



t Floral glume 1.7-2 mm. long, ligule a ring, peren- 

 nial 1^ 



f. Floral glume 2 mm. long, ligule 2-3 mm long, per- 

 ennial ^^ 



f. Floral glume 2 mm. long, ligule 5-G mm. long, per- 

 ennial ^" 



f. Floral glume 1.5 mm. long, ligule a ring, annual. . 17 



f. Floral glume 1.5 mm. long, ligule 1 mm. long, an- 

 nual 1^ 



f. Floral glume 1.5-2 mm. long, ligule 1.5-2 mm. long, 



animal ^"^ 



e. Floral glume usually more than 2 mm. long and less 



than 3 mm. long (g) 



g. Floral glume 2.2-2.5 mm. long, ligule 2-3 mm. 



long, awn 10-20 mm. long 20 



g. Floral glume 2.7 mm. long, ligule 1 mm. long, awn 

 3-6 mm. long ^1 



