92 ILLINOIS BIOLOGICAL MONOGRAPHS [182 



EXPLANATION OF PLATES 



PLATES I-IX 



Each species is represented by drawings of a flower, an opened corolla, an opened calyx, 

 a capsule (an ovary was sketched in a few species in which mature capsules were not available), 

 and a separately drawn scale for those species possessing scales. In some of the species made 

 up of different varieties drawings of the floral parts showing varietal differences have been 

 included. The drawings are enlarged about five diameters with the exception of the individual 

 scales which are enlarged about ten diameters. The scales represented on the opened 

 corollas were drawn from outlines and no attempt was made to make them accurate in all 

 details. The drawings of the individual scales, however, was made to show the details 

 correctly. 



plates x-xiii 



Besides the drawings, photographs of the flowers, capsules and seeds of many of the 

 species are included. These are enlarged about five diameters. 



