The original color films used for the plates on pages 15 and 26, were heretofore reproduced in different form in “American Wild Flowers”—Moldenke, published in 1949 by D. Van Nostrand Co., New York, with whose permission they are again reproduced here.

The pen and ink diagrams and sketches on pages 3, 60, 61, 62 and inside back cover, were prepared by Mary Chilton Gray, of the staff of Denver Museum of Natural History.