62 



Blade taper-based, with very prominent mixed ribs. 

 Koeleria cristata, Pers. (Crested Koeleria). 



Fig. 22. Acute apex of blade. 



Fig. 23. Tapered base of blade. 



Fig. 24. Transverse section of blade, shewing the 



prominent and mixed ribs (magnified). After 



Lund. 



Ribs prominent and acute. Ligule with two ears. 



Festuca sciuroides, Roth. (Barren fescue). Hair on ribs 

 as high as the ribs are deep. An annual. 



Sheath entire^ round, and keeled. 



Annual Brome Grasses. The blades remarkably thin, and 

 soft or dry. (See Note 7.) 



Fig. 1 8. Bromtts Mollis. The earless base of blade, 

 entire sheath, and short ligule. 



Sheath entire and quadrangular. Blades remarkably 

 thin and dry. Hair sparse or absent. 



An aquatic reed-grass, the giant of the group. A crown 

 of hair instead of a membranous ligule. 



Phragmites communis, Trin. (Common reed). Shoots 

 as thick as the finger, perfectly round, and hairless. 



Fig. 25. Rounded base of blade, and ligule. 

 Fig. 26. Acute apex of blade. 



