GRASSES OP IOWA. 



29 



occurs on the margin of the leaf, and also on inferior surfaces of 

 all bundles of the first and third types, and on inferior surfaces 

 of all large bundles of the secondary type. Mesophyll occu- 

 pies a small area in this species since the mestome bundles 

 are close together. 



Mr. Theo. Holm has described the anatomical characters 

 of Distichlis spicata\ a grass adapted to halophytic conditions, 



t K study of some Anatomical Characters of North American Gramlnea^ III. Bot. 

 Gazette. 16:275. pi 21. f. 1-3. 1891. Miss E L. Ogden has likewise studied the leaf 

 structure of Jouvea and of Eragrostis ohtimHora. Bull Dlv, Agros. D. 8. Dept. Agrl. 

 8: 12-20. %)l- 9- 



