OO't 



IOWA ACADEMY OF SCIENCE Vol. XXV, 1918 



Fig. 129. — Bouteloua curtipendxdu. 

 inal shoot and buds ; C, sheath. 



Tall Grama Oats. A, old culm ; B, term- 



Fig. 130. — Dactylis glomerata. Orchard Grass, 

 rhizome ; D, base of new shoot ; E, old culm. 



A, ligule ; B, collar ; C, 



