430 



INDEX 



Nepenthes, 93, 310 



Neptunia oleracea, 189-191 (Fig. 123) 



Nesaea, aerenchyma, 193 (Fig. 124), 

 194; cleistogamy, 234; distribution, 

 295 



Nesaea verticillata, 193 (Fig. 124), 194 



Nile, 113 



Nile, Blue, 192 



Nitella, 288 



Nitrogen, proportion in free and dis- 

 solved air, 253 



Nuphar luteum. See Nymphaea lutea 



Nuphar minima, 28 



Nuphar pumilum, 32 



Nymphaea, dehiscence, 35, 36; effect of 

 frost on seeds, 243; etiolation with 

 depth, 279; floating leaves, 30, 31, 

 146, 159; fruit, 34 (Fig. 17), 35, 36, 

 240; general habit, Frontispiece; 

 geophytism, 217, 323; length of 

 petiole and peduncle, 31 (Fig. 15), 40; 

 operculum of seed, 35 (Fig. 18), 36; 

 pigmented variety, 276; reduction of 

 primary root, 244, 281 ; rhizome, 24, 

 25 (Fig. 10), 26, 27 (Fig. 12), 36, 39, 

 217; roots, 25 (Fig. 10), 204, 281; 

 seedlings, 34, 35 (Fig. 18), 36, 280; 

 submerged leaves, 27 (Fig. 12), 28, 

 29, 146, 159, 279; trichome dia- 

 phragms, 272 



Nymphaea alba. See Castalia alba 



Nymphaea lutea, 6, 24, 25 (Fig. 10), 26, 

 27 (Fig. 12), 28-31, 34 (Fig. 17), 35 

 (Fig. 18), 36, 159, 243, 244, 272, 279, 

 280, 281, 288, see also Frontispiece 



Nymphaea lutea, var. rubropetala, 276 



Nymphaea pumila, 32 



Nymphaeaceae, 24-39; affinities, 309, 

 314, 318-320; air system in petioles 

 and peduncles, 37, 257; anatomy, 

 36-38, 182; ancient aquatic habit, 

 321; and water fowl, 299, 300; 

 anthocyanin, 276, 277; cleistogamy, 

 234; geophytic habit, 217; hetero- 

 phylly, 27 (Fig. 12), 28, 29 (Fig. 14), 

 146; in Lake Ellis, 286; land forms, 

 32, 195; leaf and flower, 40; leaf, 

 floating, 30, 31; leaf, submerged, 27 

 (Fig. 12), 28 (Fig. 13), 29 (Fig. 14), 

 255; mucilage, 35, 36, 38 (Fig. 20), 

 272; wound effects, 258 



Nymphaeoideae, 32, 38 



Oenanthe, aerenchyma, 188; hetero- 

 phylly, 150; perenniation, 215; root 

 system, 204, 205, 229; stomates, 166; 

 submergence, 312 



Oenanthe Phellandrium, 150, 204, 205, 

 229 



Oenanthe Phellandrium, var. fluviatilis, 

 150, 166, 215, 312 



Oenone, gill-tufts, or Kiemenbiischel, 

 119 (Fig. 81), 255 



Oenone multibranchiata, 119 (Fig. 81) 



Onagraceae, 188, 189, 311, 318 



"Open reed-swamp," 288 



Organ Mountains, 108 



Origin of Species, The, 260 



Osmotic pressure of sap in leaves and 



roots, 266 

 Ottelia, geotropism of peduncle, 239; 



heterophylly, 57 



Ouvirandra. See Aponogeton fenestralis 

 Oxygen, proportion in free and dissolved 



air, 253 ; scarcity in water life, 255 



Pacu myletes, 118 



Padina pavonia, 123 



Palms, 143 



"Fancy," 155 



Pandanaceae, 317 



Parallel veining of Monocotyledonous 

 leaves, 338 



Parra jacana, 300 



Parsnip, Water. See Sium latifolium 



Pea, 249 



Peat-bog lakes, 275 



Peaty substratum, 287 



Pedaliaceae, 151, 234 



Peplis, aerating system, 185, 259; 

 affinities, 311; anthocyanin, 276, 277; 

 cleistogamy, 234; detached shoots, 

 216, 276, 277; flowers and fruit, 230, 

 232 (Fig. 152); pollination, 230; vas- 

 cular anatomy, 175; vegetative re- 

 production, 216; winter state, 216 



Peplis Portula, 175, 185, 216, 230, 232 

 (Fig. 152), 259, 276, 277, 311 



Perenniation among hydrophytes, 215 



Perthshire, 288 



Phaseolus, 207 



Phelloderm, air-containing, 187-191 



Phellogen producing aerenchyma, 187- 

 191 



Philodendron, 206 



Phragmites, in Jura Lakes and White 

 Moss Loch, 287, 288 (Fig. 165); 

 "major plant unit," 212; root differ- 

 entiation, 207 



Phragmites communis, 207, 212 



"Phragmitetum," 288 



" Phucagrostis major," 125 



" Phucagrostis minor," 125 



Phyllanthus fluitans, 311 



Phyllode theory of Monocotyledonous 

 leaf, 52, 161, 162, 337-345 



Phyllospadix, 123, 124 



Pico, 333 



Piliferous layer, cuticularised, 208; 

 death of, before death of root-hairs, 

 264 



Pilularia, 225 



Pinguicula, insectivorous habit and 

 relation to Ulricularia, in ; polystely, 

 181 



Pinguicula vulgaris, 181 



