INDEX 



427 



Hydrocharis, anthocyanin, 276; buds, 

 summer, 43 (Fig. 24); buds, winter, 

 47 (Fig. 29), 48, 49 (Fig. 30); de- 

 hiscence, 47, 241 ; dioecism or monoe- 

 cism, 46; flowers, 46; fruits, 46, 47, 

 241; freezing, 220; germination of 

 turions, 48, 49 (Fig. 30), 280; in 

 biological classification, 7; inverted 

 bundles of leaf, 46 (Fig. 28) ; land form, 

 42, 49; leaf anatomy, 44 (Fig. 25), 45 

 (Figs. 26, 27), 46 (Fig. 28); light, 

 effect of, 280; petiole length, experi- 

 ments on, 283, 284; pollination, 236; 

 root-hairs, 42, 43; roots, 42, 43, 244; 

 stipules, 43 (Fig. 24), 44; stomates, 45 

 (Fig. 26) ; submerged form, 45 ; turions, 

 47 (Fig. 29), 48, 49 (Fig. 30); winter- 

 buds, 47 (Fig. 29), 48, 49 (Fig. 30) 



Hydrocharis asiatica, 42 



Hydrocharis Morsus-ranae, 7, 32, 42, 

 43 (Fig. 24), 44 (Fig. 25), 45 (Figs. 

 26, 27), 46 (Fig. 28), 47 (Fig. 29), 

 48, 49 (Fig. 30), 53, 54, 57, 166, 195, 



215, 219, 220, 236, 241, 280, 283 



Hydrocharis parnassifolia, 42 



Hydrocharitaceae, fresh-water, 42-57, 

 84, 151, 157, 248; marine, 123, 129- 

 131, 133, 134; other references, 169, 

 205, 235, 236, 239, 314, 340 



Hydrocleis, apical cavity of leaf, 269, 

 270 (Fig. 164); heterophylly, 157 



Hydrocleis nymphoides, 157, 269, 270 

 (Fig. 164) 



Hydrocotylevulgaris, 200, 201 (Fig. 132) 



Hydromy 'stria, 57 



Hydrophilous pollination. See Pollina- 

 tion, hydrophilous 



Hydrothrix, cleistogamy, 234; phyllode 

 leaf, 344 



Hydrothrix Gardneri, 234, 344 



Hydrotriche, affinities, 313, 318; hetero- 

 phylly, 151 



Hydrotriche hottoniae folia, 151 



Illecebraceae, 311 



Illecebrum, affinities, 311; cleistogamy, 



234 



Illecebrum verticillatum, 234 



Illumination, 157, 278-280 



"Imbibition theory," 174 



Indehiscent fruits of aquatics, 241-244 



India, 112, 191, 291, 305 



Infusoria, as food of Utricularia, 94 



Inn, River, 228 



Ireland, 210 



Iridaceae, 326 



Iris, phyllodic anatomy, 340 



Iris Pseudacorus, 199 



Isoetes, altitude, 291 ; in peaty water, 

 287; in mountain lochs and heath 

 pools, 290; ousted by Potamogeton, 

 333; replacement of sporangia by 

 plantlets, 225 



Isoetes amazonica, 291 

 Isoetes echinospora, 225 

 Isoetes lacustris, 225 

 Italy, 303 



Ivy-leaved Duckweed. See Lemna 

 trisulca 



Japan, 17 



Juncaginaceae, 248, 313, 314 



Juncus, 299, 309 



Juncus conglomerate, 299 



Jura lakes, 279, 287, 290, 323 



Jussiaea, aerenchyma from phellogen, 

 189, 190 (Fig. 122); affinities, 311, 

 318; breathing roots, 189; replace- 

 ment of cork by aerenchyma, 188, 

 189; roots not floats, 192, 193; sub- 

 mersed leaves whorled, 230 



Jussiaea amazonica, 230 



Jussiaea grandi flora, 189 



Jussiaea peruviana, 189, 190 (Fig. 



122) 



Jussiaea repens, 189, 193 



Kaieteur, 109 



Kerguelen's Land, 233 



" Kiemenbiischel " (gill-tufts) of Oenone, 



118, 119 (Fig. 81), 255 

 Kingston, 273 

 Kurdestan, 303 



Laboul, 291 



Lace-plant of Madagascar. See Apono- 



geton fenestralis 

 Lads alata, 120 

 "Lady-Smocks," Grew on heterophylly 



in > 155 



Lady's Smock. See Cardamine pratensis 

 Lake dwellings, 302 

 Lake Ellis, North Carolina, 286 

 Lake George, Florida, 213 

 Lake St Clair, Michigan, 288 

 Lakenheath Lode, 216 

 Land forms, of water plants, 195-198; 



of Alismaceae, 20, 21 (Fig. 9), 153 



(Fig. 101), 195; Cattitriche, 195; 



Cardamine, 202 (Fig. 133); Hottonia, 



197 (Fig. 127); Hydrocharis, 42, 49, 

 195; Lemnaceae, 77, 78; Limnan- 

 themum, 19*5 ; Limosella, 198 ; Littorella 



198 (Fig. 128); Myriophyllum, 195, 

 223 (Fig. 146); Nymphaeaceae, 32, 

 195; Polygonum, 152 (Figs. 99 and 

 i oo), 197, 198; Potamogeton, 195, 196 

 (Fig. 125); Ranunculus, 195, 196 (Fig. 

 126), 203 (Fig. 134) 



Land plants, effect of water upon, 200, 



201 (Fig. 132) 



"Law of Age and Area," 305-307 

 "Law of Irreversibility, " 336, 347 

 "Law of Loss," 182, 3~36-347 

 Lawia, germination, 117; mucilaginous 



seeds, 300; shoot thallus, 117; special- 



