cellent text for Gramineae. Tne late Marcus E. Jones looked over 
Allium and Astragalus, and Charles Piper Smith determined Luvinus. 
It was not possible to adopt all of his Opinions, however. Dr. 
Philip A. Munz generously determined the genera Epilobium and 
Oenothera. Many of the Umbelliferae were determined by Dr. Mildred 
Mathias. Mrs. Eileen Erlanson generously studied Rosa. Dr, S. F. 
Blake named many Compositae, Dr. Eva Fling Roush, Sidalcea, and Dr, 
C. R. Ball, Salix. Furthermore, Dr. Ball assisted in preparation of 
manuscript for Salix, Mr. Alan A. Beetle looked over critically the 
collections of Bleocharis, and Elmer I. Applegate those of Erythronium 
and both made suggested comments for the keys. Dr. Rimo Bacigalupi 
read the text for Saxifragaceae, making valuable Suggestions, Dr. R. ] 
Woodson determined Apocynum and Dr. I. M. Johnston, most of the Bora- 
ginaceae. The work of Dr. F. W. Pennell upon the Scrophulariaceae, ie 
especially appreciated both in determinations and valuable Suggest ions 
and additions to the keys and text. The authors are grateful to all 
or these. 
The junior author is indebted to his wife, Nesta Dunn Ewan, 
for perennial assistance and encouragement, and to the University of 
Colorado for support of the revision. 
Carl Epling 
University of California, 
Los Angeles 
