ACKNOWLEDGMENTS 
I would like to express my thanks to the curators of 
herbaria who have graciously lent specimens cited in this 
paper. Abbreviations of herbaria are taken from Index 
Herbariorum (Lanjouw and Stafleu, 1964). I am grate- 
ful to Dr. William 'T. Gillis and Professor Richard E. 
Schultes for additions and comments on the manuscript 
and to Dr. Leslie Garay for assistance with the Latin 
descriptions. | am especially indebted to Dr. Alice F. 
Tryon who kindly lent the use of her microscope for 
photographing cytological specimens. Finally, I want 
to thank Lynda Bates who made the beautiful line draw- 
ings which accompany the text. 
Research reported in this paper was supported by the 
National Institutes of Health Training Grant (T’ TO] 
GM _ 00086-13) and by the National Science Foundation 
Evolutionary Biology Training Grant (GB 7846, Reed 
Rollins, Principal Investigator, Harvard University). 
