INDEX 



Diaphragms, 18, 19 (Fig. 8), 183, 184 



(Figs. 118, 119), 257 

 Dicotyledonous families, proportion of 



among aquatics, 322 

 Dicraea elongata, 115 (Fig. 77) 

 Dicraea stylosa, 114, 115 (Fig. 78), 116 



(Fig. 79), 118 

 Dictyota dichotoma, 123 

 "Differentiation Theory" of plant dis- 

 tribution, 304^307 

 Dionaea, in 

 Diplanthera, 123 

 Distribution, geographical, 73, 112, 



295-307 

 Dock, 271 



Dodder. See Cuscuta alba 

 Dodoens' Histoire des Planles, 144 

 Dollo's "Law of Irreversibility," 336, 



347 



Droseraceae, 109, in, 310 

 Duckweed. See Lemna, Lemnaceae, 



Spirodela, Wolffia 

 Duckweed, Rootless. See Wolffia 



East Anglia, flood of 1912 in, 296 

 Echinodorus ranunculoides, cleistogamy, 

 234; heterophylly, 23; inflorescence 

 and vegetative shoots, 224 (Fig. 147); 

 land and water forms, 21 (Fig. 9) 

 Ecology, 285-292 



Egypt. 332 



Egyptian cotton, aliens accompanying, 

 303 



Eichhornia, affinities, 317; air tissue in 

 petioles, 154; heterophylly, 154, 160, 

 161; phyllodic interpretation of leaf, 



341 (Fig. 169), 342 (Fig. 170), 343, 

 344; vegetative multiplication, 213 



Eichhornia azurea, 160, 161 



Eichhornia crassipes, 154 



Eichhornia speciosa, 213, 341 (Fig. 169), 



342 (Fig. 170), 343, 344 

 Elatinaceae, 310, 311 



Elatine, affinities, 311; annual species, 

 215; conveyance by birds, 301; root- 

 hairs from "collet," 245 (Fig. 158) 



Elatine hexandra, 245 (Fig. 158), 311 



Elatine hydropiper, 301, 311 



Eleocharis, 286 



Elisma, heterophylly, 23; relation of 

 inflorescence and vegetative shoot, 20 



Elisma natans, 20, 23 



Ellis, Lake, 286 



Elodea, aerating system, 256; circula- 

 tion of protoplasm, 212 ; experimental 

 cultures, 265; history in Britain, 55, 

 210-213; leaf anatomy, 165 (Fig. 

 106), 169; leaf form. 141; pollination 

 mechanism, 55, 56 (Fig. 35), 57. '34. 

 236; root-hairs, 208; vegetative re- 

 production, 55, 210-213; wintering 

 shoots, 55 (Fig. 34), 219 



Elodea callitrichoides, 55, 56, 236 



4*5 



Elodea canadensis, 6, 7, 55 (Fie 34) 57 

 165 (Fig. 106). 169, 173. 210-213, 219; 



K 253. 254. 265, 266 



Elodea densa, 57, 236 



Elodea ioensis, 55, 56 (Fig. 35) 



Embryo, macropodous, 246 (Fie. 159) 

 248 (Fig. 161). 249, 319 (Fig. 166)! 

 326; protection of, 242, 243; vivi- 

 parous, 127 



Engadine, 290 



Enhalus, 57, 123, 124, 131, 236 



Enter omorpha, 123 



Entomophily. See Pollination, ento- 

 mophilous 



Epidermis of aquatics, chlorophyll in, 

 164, 168, 169, 254; form of cells of. 

 163, 164 



Epilobium hirsutum, 188 



Epithem, 267 



Eranthis hiemalis, 319 



Eriocaulon, 286 



"Eu-anthpstrobilus," 315 



Eu-callitriche, 236. 237, 306, 307, 330 



Eucalyptus Preissiana, 256 



Eitpatorium cannabinum, 188 



Euphorbiaceae, 311 



Europe, 290, 295 



Euryale, affinities, 38; cleistogamy, 34, 

 234 



Euryale ferox, 34, 234 



Farinosae, 316, 317, 341 

 Farmeria metzgerioides, 114, 248 

 Fenestration of leaves. 142 (Fig. 91) 

 Fijis, 298, 303 

 Flagellates, 142 



"Floating-leaf association." 288 

 Floating leaves, 30-32, 44-46, et passim 

 Floating Sensitive Plant. See Neptunia 



oleracea 



Floating wood of Herminiera, 102 

 Florida, 213 



"Flossenzahne," 133, 314 

 Flowers of water plants, 227-238, etc 

 Fluviales. See Helobieae 

 Fly pollinating Sagittaria, 9 

 "Flying germinators," Water-fowl as, 



301 



Fontinalis, 225 

 Food plants, Alismaceae, 17; Alocasia. 



303; Colocasia, 303; Nymphaeaceae, 



24; Trapa, 302 

 Forest of Dean, 276 

 Freezing, effect of, 220, 243. 278 

 Frogbit. See Hydrocharis Morsus-ranae 

 Fruits of water plants. 239-249, etc. 

 Fruits, ripening under water, 239. 240 

 Fungi, 172 



Gaseous exchange, 253-259 

 Geneva. Lake of. 278 

 Gentianaceae, 39, 205, 312 

 Geographical distribution. 295-307. etc. 



275 



