EXPLANATION OF PLATES 



The flowers here illustrated are shown about four times their 

 natural size. The original drawings for these were made to the 

 same scale but there were some differences in the reduction for 

 the various plates. Fig. 10 is enlarged about 110 times and Figs. 

 25, 37, and 39 about 350 times. The photos of Plates III and IV 

 were taken natural size and are here reproduced as taken. 



