xiv LIST OF ILL USTRA TIONS. 



KIG. PAGE 



99. Scrophularia nodosa (after Bentham) r ,. 



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



lor. Ditto, more advanced j^c 



1 02. Ditto, still more advanced 14 1 



103. Bartsia odontites (after Bentham) !^5 



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



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



1 06. Euphrasia oj)icinalis (after Bentham) 148 



107. Flower of ditto 148 



1 08. PedicUaris sylvatica (after Ogle) 150 



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



no. Flower of ditto . 153 



in. Section of ditto 153 



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



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



114. Ditto, older flower ,, . 156 



115. Stamens in their natural position . 157 



116. Stamens when moved by a bee ,, ,, . 157 



117. Teucrium scorodonia, in the first state . . . J 5^ 



118. Ditto in the second state *5& 



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



1 20. Orchis niascula ,, ,, . . I 7 I 



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



except the labeiium, 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 labeiium (after Darwin) .... 172 



123. The two pollinia ,, ,, 172 



124. Ophrys apifera (after Bentham) . . . -175 



125. Cepkalanthera grandiflora ,, ,, .... 177 



126. Listera ovata ,, ,, . . . .178 



127. Flower of Cypripedium longifolium. Front view . . 180 



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



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



petals removed except the labeiium {after Darwin) 182 



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



