LIST OF ILLUSTRATIONS xxiii 



FK;. TAGE 



121. Pin us, carpel 456 



122. /.ainia and Cycas, reproductive organs 457 



123. Lily, section of stem - . 462 



124. Buttercup, structure of flower 465 



125. Transition from petal to stamen 467 



126. Angiosperms, reproduction and development 470 



[27. Helleborns, Campanula, and Ribes, flower 47 2 



