82 LEAF-STRUCTURE [CH. V 



girders : small patches of sclerenchyma at the apex 



of each stronger ridge, and on the opposite side below 



only. No hairs. 



Lolium, temidentum is similar but is more apt to be convolute, 

 whereas L. perenne is more folded. 



Alopecurus pratensis. Leaf thin and somewhat like 



Phleum, but the ridges somewhat higher and more 



rounded, and only the principal bundles girdered below. 



Stomata on both faces. 



Festuca elatior, Bromus giganteus and most species of Agrostis 

 come near Lolium. See Figs. 17, 22. 



