610 POACE.E. 



c. Branches of panicle flexuose; spikelets smooth, 

 flat, oval, floral glume broadly oval, awns 5-10 

 mm. long I'* 



c. Branches of panicle short, ascending; spikelets 

 pubescent, flat, oval, floral glume broadly oval, 



uwn G-S mm. long 15 



c. Plant otherwise than those above (d) 



d. First glume 1- (rarely :}-) nerved, second 



3-nerved (e) 



e. Joint of rachilla 2 mm. long or less, spike- 

 lots r-12-flowered 10 



e. Joint of rachilla 3 mm. long, spikelets 



3-C-flow('red 1~ 



e. Joint of racliilla more than 2 mm. long. . ( f ) 

 f. lilades involute, 2-3 mm. wide. . . 18 



1". Blades flat, 2-3 mm. wide 10 



f. lihules flat, 4 or moro mm. wide. . . (g) 



g. Awn 2-3 mm. long 20 



g. Awn 4 or more mm. long. . . . (h) 

 li. Longest rays 8-10 cm. long, an 



exotic annual 21 



h. Longest rays 3-5 cm. long, a 



native pereimial 22 



d. First glume 3-nerved (rarely l-nerved), sec- 

 ond glunui 3-nerved 23 



d. First glume 3-nerved, second o-T-iu'rved. . (i) 



i. Spikelets scabrid 24 



i. Spikelets densely silky hairy 25 



d. First glume 3-nerved (rarely 5-nerved), sec- 

 ond glume 7-nerved, spikelets firm, flat, 

 floral glume turgid, broadly oval, apex obtuse, 



exotics 2G, 27, 28 



1. B. RUBEXS L. Cent. 1:5 (1755). Festnra ruhcns Pers. Syn. 

 1:94 (1805). B. ranescens Viv. Fl. Lyb. Spec. 5 (1824). 



A soft densely tufted slender annual, 20-40 cm. high. Leaves 

 3 in number, ligule lacerate, 1.5-2 mm. long ; blades pale 



