TABLE OF CONTENTS xi 



PAGK 



maize, 136 Impervious seed-coverings, 137 Self-burial, 

 137 Water-grasses, 138 Propagation by bulblets, 139 

 Plant societies, 139 Mesophytes, 140 Xerophytes, 

 141 Prairie, 142 Sandy soil, 143 Sand-dunes, 143 

 Pine-barrens, 144 Rocks, 144 Deserts, 144 Halo- 

 phytes, 146 Hydrophytes, 146 Geographical dis- 

 tribution, 147 Distribution of grasses, 148 Distri- 

 bution of species, 148 Circumpolar distribution, 149 

 Generic distribution, 149. 



CHAPTER XIV 



TAXONOMY OR CLASSIFICATION . . a " . . , . . 151-158 

 Species, 151 Genera, 152 The grass family and its 

 subdivisions, 154 The two series of tribes, 154 The 

 tribes of grasses, 155 The more important genera of 

 grasses, 156 Characters used in classification, 157 

 Phylogeny, 157. 



CHAPTER XV 



TRIBE!. Maydex . ". "% ".." , . . . ... . 159-163 



Tripsacum L., 159 Euchlsena Schrad., 160 Zea L., 

 161 Coix L., 162. 



CHAPTER XVI 



TRIBE II. Andropogonex 164-173 



Miscanthus Anderss., 166 Saccharwn L., 166 Eri- 

 anthus Michx., 167 Subtribe Euandropogoneae, 167 

 Andropogon L., 169 Cymbopogon Spreng., 169 Holcus 

 L., 170 Classification of the sorghums, 172 Tribe III. 

 Naziese (Zoysiese), 173 Tribe IV. Melinideae (Triste- 

 ginese), 175. 



