28 



BULLETIN 461, U. S. DEPARTMENT OF AGRICULTURE. 



52. Wheat (Triticum aestivum; fig. 56). 



Collar broad, not spiral, continuous, with small, slender claws, hairy 

 along margins and claws; ligule long, truncate, toothed; sheaths not keeled, 

 free from hairs ; blades long, free from hairs, smooth, flat, the older ones 

 abrupt pointed, one-half inch wide. 



Fig. 53. — Oats (Arena saliva). 



Fig. 54. — Emmer (Triticum dicoccum) . 



53. Barley (Hordeum sativum; fig. 57). 



Collar broad, prominent, yellow, sometimes red, one side higher than the 

 other, with large claws clasping the young shoot spirally ; ligule membra- 



Fig. 55. — Spelt (Triticum spclta). 



Fig. 56. — Wheat (Triticum sativum). 



nous, medium long, acute, entire; sheaths sparsely hairy; blades broad at 

 base, shorter than (hose of wheat, rough on upper surface, one-half inch 

 wide, sharp pointed ; nerves not prominent, covered with white specks when 

 viewed under a lens. 



