INDEX 



425 



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 dtchotoma, 123 



"Differentiation Theory" of plant dis- 

 tribution, 304-307 



Dionaea, iii 



Diplanthera, 123 



Distribution, geographical, 73, 112, 

 295-307 



Dock, 271 



Dodder. See Cuscuta alba 



Dodoens' Histoire des Planies, 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 yanunciiloides, 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 nutans, 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, 134, 

 236; root-hairs, 208; vegetative re- 

 production, 55, 210-213; wintering 

 shoots, 55 (Fig. 34), 219 



Elodea callilrichoides, 55, 56, 236 



/ 



Elodea canadensis, 6, 7, 55 (Fig. 34), 57, 

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

 253, 254, 265, 266 



Elodea densa, 57, 236 



Elodea ioensis, 55^ 56 (Fig. 35) 



Embryo, macropodous, 246 (Fig. 159), 

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

 326; protection of, 242, 243; vivi- 

 parous, 127 



Engadine, 290 



Enhalus, 57, 123, 124, 131, 236 



Enteromorpha, 123 



Entomophily. See Pollination, ento- 

 mophilous 



Epidermis of aquatics, chlorophyll in, 

 164, i68, 169, 254; form of cells of, 

 163, 164 



Epilobium hirsutum, 188 



Epithem, 267 



Eranthis hiemalis, 319 



Eriocaulon, 286 



"Eu-anthostrobilus, ' 315 



Eu-calhtriche, 236, 237, 306, 307, 330 



Eucalyptus Preissiana, 256 



Eupatorium 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, 192 

 Florida, 213 



"Flossenzahne," 133, 314 

 Flowers of water plants, 227-238, etc 

 Fluviales. See Helobieae 

 Fly pollinating Sagittaria, g 

 "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 Mnrsus-ranae 

 Fruits of water plants, 239-249, etc. 

 Fruits, ripening under water, 239, 240 

 Fungi, 172 



Gaseous exchange, 253-259 

 Geneva, Lake of, 278 

 Gentianaceac, 39, 205, 312 

 Gcographicaldistribution, 295-307, etc. 



275 



