43 



INDEX 



Potamogeton crispus, 61, 62 (Fig. 39)-64 



(Fig. 40), 67 (Fig. 42), 68 (Fig. 43), 69, 



71, 164, 269, 275, 295 

 Potamogeton densus, 65 (Fig. 41), 71, 



167 (Fig. 108), 206 (Fig. 137), 268, 298 

 Potamogeton fluitans, 69, 151, 157, 158 



(Fig. 104) 



Potamogeton heterophyllus, 61, 195 

 Potamogeton lucens, 61-64 (Fig. 40), 164, 



173, 262, 330, 339 (Fig. 167) 

 Potamogeton natans, 6, 31, 32, 61, 62 



(Fig. 39), 63, 65 (Fig. 41), 66, 70, 72, 



151, 157, 159 (Fig. 105), 166, 167 (Fig. 



i07),i8 4 (Fig.n8),i95,i96(Fig.i25), 



272, 280, 289, 301, 339 (Fig. 168) 

 Potamogeton obtusifolius, 206 

 Potamogeton pectinatus, 62-64 (Fig. 40), 



65 (Fig. 41), 66, 70, 134, 262, 282, 291 

 Potamogeton pennsylvanicus, 303 

 Potamogeton perfoliatus, 58, 59 (Fig. 36), 



61, 63, 69, 71, 140, 195 

 Potamogeton polygonifolius, 196 (Fig. 



125), 333 



Potamogeton praelongus, 62 

 Potamogeton pulcher, 61, 62 (Fig. 39), 63, 



65 



Potamogeton pusittus, 63, 64 (Fig. 40), 



66, 71 



Potamogeton rufescens, 69 (Fig. 44) 

 Potamogeton trichoides, 62, 66, 71 

 Potamogeton varians, 195 

 Potamogeton zosterifolius, 61 (Fig. 38) 

 Potamogetonaceae, fresh- water, 58-72; 



marine, 123-129, 131-135, 237, 331; 



other references, 205, 248, 314-316, 



Primulaceae, 180, 312, 318 

 Proserpinaca palustris, heterophylly, 



159-161 

 Protection of embryo in aquatics, 242, 



243 



Pseudo-callitriche, 134, 237, 306, 307 

 Pseudo-lamina, 339, 340, 341 



Quercus, 207 



Rafts of wood of Herminiera, 192 

 Ranales, 146, 238, 308, 319, 320, 321, 346 

 Range, wide, of aquatics, 295 

 Ranunculaceae, 309, 313, 314, 320 

 Ranunculus, affinities, 318; air spaces, 

 1 76 (Fig. 113), 185; altitude, 290; am- 

 phibious, aquatic and terrestrial types, 

 200, 309, 320; dimensions of dissected 

 leaves, 140; geotropic curvature of 

 peduncle, 145 (Fig. 93), 239; germina- 

 tion, 280; heterophylly, 144 (Fig. 92), 

 145, 146, 155; in biological classifica- 

 tion, 6; land and water forms, 195, 

 196 (Fig. 126), 198, 203 (Figs. 134, 

 135); luxuriance, 214; non-hetero- 

 phyllous form, 145 (Fig. 93); root- 

 system, 204, 264; sinking of seeds, 



297; stem anatomy, 175, 176 (Fig 

 113); sub-aquatic flowering, 233, 234; 

 submerged leaves, 29, 140, 142; sub- 

 mergence of inflorescence, 228; sup- 

 port of inflorescence, 228; toleration 

 of salt, 134; winter-buds, 219 



Ranunculus aquatilis, 144, 145, 155, 196 

 (Fig. 126), 204, 234, 280, 297 



Ranunculus Baudotii, 134 



Ranunculus carinatus, 228 



Ranunculus circinatus, 145 



Ranunculus confusus, 228 



Ranunculus divaricatus, 234 



Ranunculus Flammula, 145, 198, 203 

 (Figs. 134, 135), 309, 320 



Ranunculus fluitans, 145, 214, 228, 233 



Ranunculus hederaceus, 145 (Fig. 93) 



Ranunculus heterophyllus, 145 



Ranunculus Lingua, 146, 219 



Ranunculus Purschii, 144 (Fig. 92) 



Ranunculus repens, 200 



Ranunculus sceleratus, 146, 284, 320 



Ranunculus trichophyllus, 140, 176 (Fig, 

 113), 228, 290 



Ranunculus sect. Batrachium, 6, 29, 142, 

 144-145, 175, 185, 195, 228, 239, 264, 

 309, 318, 320 



Rheotropism, 282 



Rhizomatous plants of Jura Lakes, 323 



Rhizome, and polystely, 182; rhizome 

 of Castalia, 2426 (Fig. n), 217; 

 Gunner a, 182; Hippuris, 173 (Fig. 

 112); Hottonia, 197 (Fig. 127); Lim- 

 nanthemum, 39-41 (Figs. 22, 23), 217; 

 Nymphaea, 24, 25 (Fig. 10), 27 (Fig. 

 12), 217; Potamogeton, 58-60 (Fig. 37) 



Rhizopods, as food of Utricularia, 94 



Rhyncolacis macrocarpa, 120, 121 



Ribbon leaves, n (Fig. 3), 12, 13 (Fig. 

 4), 14 (Fig. 5), 19, 20, 22, 23, 140, 

 141, etc. 



Riccia, 225 



Rice, aliens accompanying, 303 



Ricinus, 200 



River-basins, isolation of, 296 



Rodriguez, 129 



Root-caps, of Brasenia, 205 ; of Lemna- 

 ceae, 74 



Root-hairs, absence of, in Lemna tri- 

 sulca, 208, in water roots of Elodea, 

 208; in Hydrocharis, length of, 42, 43, 

 208; protoplasmic rotation, 43 



Rootless Duckweed. See Wolffia 



Roots of water plants, 204-209 ; aeren- 

 chyma, secondary, 188, etc.; air 

 tissue, 185, 186 (Fig. 121), 187; 

 anatomy, 65 (Fig. 41), 208, 209 (Figs. 

 138-140); assimilation, 207; differen- 

 tiation, 207; equilibrium, 207; im- 

 portance in life of aquatics, 264-266; 

 reduction of, 208, 244; spiral or 

 tendril, 127, 205 (Fig. 136), 206 (Fig. 

 137) 



