30 BULLETIN 461, U. S. DEPARTMENT OF AGRICULTURE. 



55. Rye (Secale cereale; fig. 59). 



Collar broad, not spiral, continuous, with fine, sharp claws barely over- 

 lapping ; ligule short, truncate, lacerate ; sheaths sometimes hairy ; blades 

 toothed on margins, hairy at base on upper side, sparsely hairy elsewhere, 

 one-half inch wide, abrupt pointed. 



The sheaths and blades are usually covered with a powdery bloom, which gives a pale 

 bluish cast to this plant. 



56. Durum wheat (Triticum durum; fig. 60). 



Collar broader than that of common wheat, but not so noticeable as that 

 of barley ; claws small, free from hairs ; ligule acute, thin, membranous, 

 toothed, medium long ; sheaths free from hairs ; blades prominently nerved, 

 soft, glabrous, one-half inch wide, abrupt pointed. 



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