Fig. 104. Diagram of the "Flower," or Strobilus, of Cycadeoidea dacotensis, 

 a Fossil Plant from the Black Hills, South Dakota 



a. Hairy, green sheathing bracts; b, folded stamens; c, elongated axis; d, conical mass of 

 sterile and fertile scales, the latter bearing terminal naked seeds. From somewhat 

 similar ancestors modern flowers were perhaps derived. (After Wieland) 



