A DESCRIPTIVE AND GEOGRAPHICAL STUDY 

 OF THE GRASSES OF IOWA. 



BY L. H. PAMMEL 

 CARLETON R. BALL AND F. LAMSON-SCRIBNER 



CONTENTS. 



Gramineee 1 



General Description 1 



Classification of Grasses 2 



Tribe I . Maydeae 6 



Key to the genera of Maydeae 6 



Euchlaena 6 



Zea -....■ 8 



Coix 19 



Tripsacum 20 



Tribe II . Andropogonese 22 



Key to the genera of Andropogoneae 22 



Miscanthus 23 



Erianthus 24 



Saccharum 25 



Andropogon 26 



Tribe III. Osterdamiae 40 



Osterdamia 40 



Tribe IV. Tristegineae 42 



Tribe V. Paniceae 42 



Key to the genera of Paniceae , . . . . 43 



Paspalum 43 



Panicum 47 



Setaria 83 



Cenchrus 91 



Pennisetum 94 



Tribe VI. Oryzese 96 



Key to the genera of Oryzeae 96 



Zizania 96 



Leersia 98 



Tribe VII. Phalarideae 105 



Key to the genera of Phalaride ae 106 



Phalaris 106 



Anthoxanthum 109 



Hierochloe Ill 



