Minnesota Plant Life. xvii 



FIG. 75. Rock on the St. Croix river, near Taylor's Falls. Shows zonal 

 distribution of trees. White pines stand on top of the rock, 

 and birches and poplars on the sides. After photograph by 

 Mr. H. C. Cutler 195 



FIG. 76. Bur-reed. After Britton and Brown 198 



FIG. 77. Lakeside vegetation. Just off shore is a growth of the floating 

 pondweed, then of arrowheads, while farther out are reeds 



and rushes. After photograph by Williams 199 



FIG. 78. Clasping-leaved pondweed. After Britton and Brown. ....... 200 



FIG. 79. Evening scene in Minnesota. Arrowheads, bulrushes and wil- 

 lows in foreground. After photograph by Williams 201 



FIG. 80. Arrowhead. After Britton and Brown 202 



FIG. 81. Eel-grass. After Britton and Brown 202 



FIG. 82. Wild rice and pond lilies. After photograph by Williams 204 



FIG. 83. Beard-grass. After Britton and Brown 205 



FIG. 84. Barnyard grass. After Britton and Brown 205 



FIG. 85. Minnesota Muhlenberg grass. After Britton and Brown 206 



FIG. 86. Beckman grass. After Britton and Brown 206 



FIG. 87. Indian corn in the shock. After photograph by Williams 207 



FIG. 88. Wild rice in a Minnesota lake. After photograph by Williams 208 



FIG. 89. Wild rice. After Britton and Brown 209 



FIG. 90. Kalm's brome-grass. After Britton and Brown 209 



FIG. 91. A cluster of sedge-flowers (Carex-type), a single pistillate 

 flower with one fruit rudiment, and a staminate flower with 



three stamens. After Atkinson 210 



FIG. 92. Cyperus-sedge. After Britton and Brown 211 



FIG. 93. Cotton-grasses growing in a bed of peat-moss. Near Grand 



Rapids. After photograph by Mr. Warren Pendergast 212 



FIG. 94. Lake border vegetation. Bulrushes and reed-grasses. After 



photograph by Williams 213 



