INDEX. 



731 



Inulin, 108, 417 



Iodine, 65 



Ipomoea, 710 



Ipomoea acetosaefolia, 590 



Ipomoea pes-caprae, 590, 592 



Iridaceae, 703 



Iris, 703 



Irritability, 125-135 



Isoetales, 296 



Isoetes, 289-291, 292, 627 



Isoetineae, 296 



Iva imbricata, 599 



Ivy, 708 



Jack-in-the-pulpit, 373 

 Jewelweed, 707 

 Juglandales, 704 

 June-berry, 707 

 Jungermanniales, 242 



Kalmia latifolia, 444 

 Karyokinesis, 341-344 

 Kelps, 1 68 

 Kingdom, 653 

 Kochia americana, 572 

 Koehleria cristata, 559 



Labiatae, 423, 694, 710 



Laboulbeniales, 218 



Labrador tea, 609, 709 



Lactuca canadensis, 460 



Lactuca scariola, 409, 460, 461 



Lagenidium, 214, 215 



Laminaria, 168, 169, 628 



Lamium, 424, 694, 710 



Larch, 367 



Lathyrus maritimus, 592 * 



Laurel, 709 



Layers, 525 



Leaf patterns, 404 



Leather leaf, 609 



Leathesia difformis, 168 



Leaves, form and arrangement, 383- 

 391; function of, 387; protective 

 modifications of, 392; protective 

 positions, 395; reduction of sur- 

 face, 394; relation to light, 397; 

 structure of, 40-43, 131, 391, 393 



Legumes, 92, 93, 453 ^ 



Leguminosae (=Papilionaceae), 396, 



399 



Leitneria floridana, 704 

 Leitneriales, 704 



Lemanea, 171, 173, 175, 492, 623, 

 626, 627 



Lemna, 418, 627 



Lemna trisulca, 26, 27 



Lenticel, 357, 358 



Lepiota naucina, 208 



Lettuce, 711 



Leucoplast, 71 



Liana, 545 



Lichen tundra, 579 



Lichens, 86, 93-95, 220, 221, 578; 

 formations on rocks, 600-603 



Life areas, 500-504 



Life regions, 500-504 



Life zones, 500-504, 641-647 



Light, 467 



Light, regions of, in water, 621 



Liliaceae, 650-652, 654, 703 



Liliales, 651, 652, 654, 703 



Lilium, 650, 703 



Limnetic plant societies, 624-627 



Linaria vulgaris, 696, 711 



Linden, 708 



Linum vulgaris, 707 



Lipase,' 108 



Liquidambar, 706 



Liriodendron, 706 



Lithophytes, 621., 



Live-forever, 394 



Liverworts, 222-239, 653; absorp- 

 tion by, 23-25; classification of, 

 242 



Lobelia, 711 



Lupinus perennis, 3553 



LycoperdaJPs, 220 



Lycopodiaceae, 296 



Lycopodiales, 296 



Lycopodiineae, 296 



Lycopodium, 24~286 



Macrophytes, 622 

 Macrosporangium, 94, 302, 304, 311, 



312, 321 



Macrospore, 287, 290, 326-328, 434 

 Magnolia, 705, 706 

 Mallow family, 708 

 Malvales, 708 



Mangrove swamps, 538, 618 

 Maple family, 685, 707 

 Marchantia, 24, 226-236 

 Marchantiales, 242 

 Marine plant societies, 627-629 

 Maritime ruppia, 618 

 Marl ponds, 619, 624 



