INDEX 
Knot-grass (Polygonum), 206, Fig. 
49, 
L 
Labiate (Mint family), 214, 253. 
Labiatiflore, 214, 215, 218, 219, Fig. 
53. 
Laboulbeniacex, 99. 
Lacune (air-spaces), 140, 141, Fig. 
Lady’s-slipper (Cypripedium), 194, 
Fig. 47. 
Lamina (of leaf), 201. 
Laminaria, 68. 
Lamium, 215, 253, 254, Fig. 53. 
Larch (Larix), 168. 
Larkspur (Delphinium), 207, 208, 
247, Fig. 50. 
Laurel, 21, 230. 
Leaf, 10, 20, 21, 30, 69, 106, 107, 114, 
115, 126, 129, 130, 131, 140, 145, 146, 
149, 150, 160, 161, 162, 163, 167, 168, 
183, 187, 193, 196, 201, 268, 290; 
Cycads, 162, 163; Conifers, 167, 
168; Equisetum, 140; Ferns, 130, 
131; Isoétes, 150; Liverworts, 106, 
107 ; Lycopods, 144, 145; Phaophy- 
ce, 69; Saprophytes, 196, 279; 
Xerophytes, 271. 
Leaf-cutting ants, 261. 
Leaf-tendrils, 278. 
Leguminose (Pea family), 204, 212, 
231, 252, 280. 
Lejeunia, 106, Fig. 27. 
Lemna (see also ‘‘ Duckweed ’’), 182, 
185, 187, 270, Fig. 45. 
Lepidodendron, 147, 148, 155, 156, 
172, 226. 
Leptosporangiate, 133, 134, 135, 136, 
137, 138, 146, 150, 154, 155, 156, 157, 
224; distribution of, 136, 137, 138; 
fossil, 188, 224; Sporangium, 134, 
135, Fig. 35. 
Liana (see also ‘“‘ Creeper,”’ ‘‘ Climb- 
ing plants ’’), 276. 
Lichens, 97, 98, 99, 100, 275, 276, 280. 
Life-history. as a clue to relation- 
ships, 15. 
309 
Light (influence on plant growth), 
17, 23, 30, 262, 277, 282, 297. 
Lilac, 215. 
Liliacez (see ‘‘ Lily family ’’). 
Liliiflore, 189, 192, Fig. 46. 
Lily, L. family, 189, 190, 191, 197, 
198. 
Linaria, 215, Fig. 53. 
Linin, 5. 
Linnea, 230, 239. 
Lip (of Orchids), 194, 195, 254, 255. 
Liriodendron, 207, Fig. 50. 
Liverwort (see also ‘‘ Hepatice’’), 
29, 101, 102, 103, 106, 107, 108, 109, 
111, 112, 113, 114, 115, 116, 119, 120, 
+ 121, 125, 126, 128, 129, 132, 137, 148, 
153, 156, 157, 223, 273, 275, 276, 283, 
239; embryo, 109, 129; fossil L., 
223; leafy L., 106, 107, 114, 119; 
thallose L., 106, 107, 112, 115, 119; 
Figs. 26, 27, 31. 
Lizard, reproduction of lost parts, 
25. 
Locomotion in plants, 282. 
Locust (Robinia), 24, 283. 
Lodicule, 185. 
Loranthus, 278. 
Lotus (Nelumbo), 207, Fig. 50. 
Louisiana, 238. 
Lupine, 241, 280. 
Lycoperdon (see also ‘‘ Puff-ball ’’), 
95. 
Lycopod, Lycopodinee (see also 
**Club-moss”’), 139, 143, 144, 145, 
152, 155, 156, 157, 167, 175, 225, 292, 
293; embryo of, 144, 145; fossil L., 
147, 154, 155, 225, 226; gametophyte 
of, 143, 144, 145; sporophyte, 146; 
Figs. 37, 38. 
Lycopodiacee, 143, 144. 
Lycopodium, 143, 144, 145, 146, 147, 
148, 152, 225; L. clavatum, 148; 
L. dendroideum, 143, Fig. 37. 
Lygodium, 135, Fig. 35. 
M 
Macrocystis (see also ‘‘ Giant Kelp”’), 
68. 
