xiv LIST OF ILL USTRA TIONS. 



PAGE 



99. Scrophularia nodosa (after Bentham) ..... 144 



100. Section of Digitalis purpurea (after Ogle) .... 145 



101. Ditto, more advanced ....... 145 



1 02. Ditto, still more advanced .... 145 



103. Bartsia odontites (after Bentham) ..... !^6 



104. Ditto. Flower wilh a short pistil (after Miiller) . . . 147 



105. Ditto. Flower with a long pistil ,,... 147 

 1 06. Eupkrasia officinalis (after Bentham) . . . . .148 



107. Flower of ditto ......... 148 



1 08. Pedicularis sylvatica (after Ogle) . . . . .150 



109. Lamium album (after Bentham) . . . . . .152 



no. Flower of ditto ......... 153 



in. Section of ditto . ........ 153 



112. Sahia officinalis. Section of a young flower (after Ogle) . 156 



113. Ditto, visited by a Bee ,, ,, . 156 



114. Ditto, older flower ,, ,, . J 5^ 



115. Stamens in their natural position ,, . T 57 



116. Stamens when moved by a bee ,, ,, . *57 



117. Teucrium scorodonia, in the first state . . . .15 



1 1 8. Ditto in the second state . . . . . . 1 5& 



119. Chenopodium bonus-henriciis (after Bentham) . . .165 

 1 20. Orchis mascula ,, ,, . I 7 I 



121. Side view of flower, with all the petals and sepals cut oil 



except the labellum, of which the near half is cut away, 

 as well as the upper portion of the near side of the nectary 

 (after Darwin) .... ... .172 



122. Front view of flower, with all sepals and petals removed 



except the labellum (after Darwin) . . . . 172 



123. The two pollinia ,, , ...... I7 2 



124. Ophrys apifera (after Bentham) . -175 



125. Cephalanthera grandiflora ,, ,, .... 177 



126. Listera ovata ,, ,, . .178 



127. Flower of Cypnpedium Jongifolium. Front view . . 180 



128. Ditto. Seen from the side . . . . . .180 



129. Side veiw of Catasetum saccatwn, with all the sepals and 



petals removed except the labellum (after Darwin) 182 



130. Section of ditto, with all the parts a little expanded 183 



