xvi LIST OF ILLUSTRATIONS 



FIG. PAGE 



154. Callitriche verna, L. Flowering shoot. [A. A.] . . . 237 



155. Pontederia rotundifolia, L. Flowering shoot. [Hauman-Merck, L. 



(191 3 1 )] . 240 



156. Limnanthemum nymphoides, Hoffmgg. and Link. Fruit and seed. 



[A. A.] . . 240 



157. Limnanthemum nympbotdes, Hoffmgg. and Link. Fruit wall. [A. A.] 242 



158. Elatine bexandra, D. C. Germination of seed. [Klebs, G. (1884)] 245 



159. Zannicbellia polycarpa, Nolte. Fruit. [Raunkiaer, C. (1896)] . 246 



160. TrapanatanSjL,. Seed and germination. [Goebel, K. (1891-1893)] 247 



161. Zoster a marina, L. Fruit. [Raunkiaer, C. (1896)] .... 248 



162. Transpiration experiment. [Sauvageau, C. (I89I 1 )] . . . 262 



163. Callitriche autumnalis, L. Leaf apex. [Borodin, J. (1870)] . . 268 



164. Hydrocleis nymphoides, Buchen. Apical cavity of leaf. [Sauvageau, 



C. (1893)] ... 270 



165. Section across White Moss Loch. [Matthews, J. R. (1914)] . . 288 



1 66. Ruppia bracbypus, J. Gay. Fruit. [Raunkiaer, C. (1896)] . .319 



167. Potamogeton lucens, L. Range of leaf form. [Raunkiaer, C. (1896)] 339 



1 68. Potamogeton natans, L. Range of leaf form. [Raunkiaer, C. (1896)] 339 



169. " Lamina " of Pontederia cordata, L. and Eicbbornia speciosa, Kunth. 



[Arber,A. (1918)] . 34 1 



170. Leaf anatomy of Pontederiaceae. [Arber, A. (1918)] . . . 342 



171. Leaf anatomy of Sagittaria. [Arber, A. (1918)] .... 345 





