AVION E.E. 359 



a. Florets deciiluoiis. oTiipty ^ij:1iiiiu's persistent. . . . (c) 



c. Awii of llonil gluino on the hiii'k. ...... (d) 



d. Spikelets 1 cm. or less loii;^- , . (e) 



e. Flowers all perfect or the upper oues staiiii- 



uute or neuter (j\ 



i. Floral glume obtuse or denticulate. . . (k) 

 k. Awns taiier-pointed, not articulate. . I (J 

 k. Awns cylindrical, articulate near the 



middle, apex clavate 75 



i. Floral glume '^-toothed, lower floret 



awned 77 



e. Florets 2, the lower one staminate and 

 strongly awned. the upper one perfect and 



more or less awned 79 



d. Spikelets more than 10 nun. long 78 



C. Awn of floral glume between 2 teeth or lobes. . . (m) 

 m. S[)ikelets 2-flowered, the uj)per one perfect or 

 l)i,stillate, the lower staminate, spikelets in 



threes. , 8q 



m. Si)ikelets 3- to several-flowered, all perfect or 



the upper imperfect. 81 



73. (157). HOLCUS L. Sp. PI. 1047 (1753). 

 Spikelets deciduous as a whole, ^-flowered, numerous and 

 crowded in an open panicle, the lower flower perfect, the upper 

 staminate; rachilla articulate above the outer glumes. Empty 

 glumes 2, nearly equal, conduplicate, acute, the second broader, 3- 

 nerved, acute or extended into an awn; floral glume shorter, mem- 

 branous, the lower awtdess, the upper with a sliort dorsal l)ent 

 awn; palea2-kecled. Stamens 3. Stvles distinct, Grain oblouf. 

 nu;luded but not adherent. 



Soft annual or perennial grasses, with blades flat or rarely con- 

 duplicate. 



Sp.'cies S, found in Europe, Africa, ami one or more spread by 

 the agency of man. 



The genus //olrxs was made by LinnuMis and continued by 

 Robert lirown to include species now separated aiul placed in Sor- 



