544 



Minnesota Plant Life. 



Hop tree, 3O7 

 -hornbeam (Half-tone, 245), 



245, 246 



Hornbeam, 246 

 Horned liverwort, 139 

 liverwort, Relation to club- 

 moss, 14 

 Hornwort, 264, 267 

 Horse-chestnut, 309, 3*7 

 family, 3*7 

 gentian, 388, 391 

 -tail (Engr. 176), 175 

 -tail, Minnesota, 178 

 -tail, underbrush habits, 179 

 Horse-tail, Dwarf, 179 

 Field, 1/8 

 Forest, 178 

 Water, 178 

 Horsemint, 375, 376, 377 

 Hot spring, 4 2 4 

 spring algae, 31 

 spring vegetation, 453 

 Hound's-tongue, 37i 

 Houstonia, 388, 389 

 Fringed, 39 

 Long-leaved, 390 

 Huckleberry, 350, 357 

 Bog, 356 

 Squaw, 356 

 Hudsonia, 327 

 Humus, 438, 459 

 plants, 479, 489 

 Husk, Corn, 207 

 Hybrids, Indian corn, 207 

 Hydrangea, 280 

 Hydrophyte, 442 

 Modified, 453 

 Hydrophytic vegetation, 462 

 Hyssop, 367, 375, 377 

 Ice-cream, Diseases, 113 

 Ice-plant, 259 

 Immunity to disease, 106 

 India-rubber tree, 251 

 Indian corn, 205, 206 

 corn hybrids, 207 

 corn, Smut, 48 

 cup, 408, 409 

 currant, 392 

 lotus, 264, 267, 452 

 pink, 379, 382 

 -pipe, 350, 352, 438, 479 

 -pipe, Resemblance to pine- 

 sap, 353 

 plantain, 412 



Indian reservations, 379 



rice (see wild rice), 205 



tobacco, 407 



tobacco lobelia, 398 



turnip, 217, 300 



uses, Birch-bark, 247 



Indigo-plant, 280 



False, 297 



Infectious diseases, 106 



Inoculation, 107 



Insect pollination of orchids, 229 



pollination of pipe-vine, 257 



Insects, 20 



Instinct of self-preservation, 510 



International boundary, 



281, 309, 322, 356, 357, 362 

 Interrupted fern, 164 



Introduced plants, u 



Invasive diseases, 106 



Involucre, 399 



Burdock, 399 



Cocklebur, 399 



Involucred honeysuckle, 393 



Iodine, Manufactured from algae, 41 

 Iris (See blue flag), 220, 224 



Iron, 102 



bacteria, 102 



bacteria and iron ores, 120 



oxide, Extraction by algae, 30 

 Ironweed, 401, 405 



Ironwood (Half-tone, 245), 245, 246 

 Irritable behavior, Living sub- 

 stance, 498 

 behavior, Plant organs, 500 

 Irritability, 488, 497 

 Islands in Lake of the Woods 

 (Half-tone), 7, 468 

 in Mississippi river (Half- 

 tone), 14 

 Isle Royale, 329 

 Ivy, 432, 502 

 Poison (Engr. 311), 



309, 310, 3H, 506 

 -leaved duckweed (See three- 

 cornered duckweed), 220 

 Jack-in-the-pulpit (Half-tone, 

 431), . 197, 217, 218, 219, 450., 479 

 Leaves, 43 

 Parasitic alga, 37 

 Tack-pine, 186, 470 

 Jack-pine-barren, 470 

 Economic importance, 190 

 Jasmine, 360 



