[Vor. 11 
100 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
lections, sincere appreciation is hereby expressed to Dr. B. L. 
Robinson of the Gray Herbarium, Dr. N. L. Britton of the New 
. York Botanical Garden, Dr. K. M. Wiegand of Cornell University, 
Mr. Stewardson Brown and Dr. F. W. Pennell of the Philadelphia 
Academy of Natural Sciences, Mr. W. В. Maxon of the United 
States National Herbarium, Dr. C. F. Millspaugh of the Field 
Museum, Dr. J. A. Nieuwland, in charge of the Greene Herba- 
rium at Notre Dame University, Dr. Aven Nelson and Dr. E. B. 
Payson of the Rocky Mountain Herbarium at the University of 
Wyoming, Dr. Helen M. Gilkey of the Oregon Agricultural 
College, Dr. W. L. Jepson of the University of California, Miss 
Alice Eastwood of the California Academy of Sciences, Dr. L. R. 
Abrams of Stanford University, Dr. P. A. Munz of the Baker 
Herbarium at Pomona College, and to Mr. S. B. Parish and Dr. 
A. Davidson of California, who loaned or donated a number of 
specimens from their own herbaria. Thanks are also due the 
Director of the Kew Herbarium for photographs and fragments 
of type material of several species. To Dr. George T. Moore, 
Director of the Missouri Botanical Garden, the writer is indebted 
for the use of library and herbarium facilities placed unreservedly 
at her disposal. Most especially, however, is it a pleasure to the 
writer to acknowledge a feeling of deep obligation to Dr. J. M. 
Greenman, Curator of the Herbarium at the Missouri Botanical 
Garden, for the encouragement, courtesy, and assistance which 
were at all times so cheerfully given while this investigation was 
under way. 
In addition to the study of herbarium specimens, some experi- 
mental work was done. Seeds of a number of species were grown 
under varying conditions in the gardens and greenhouses at the 
University of California, Stanford University, Missouri Botanical 
Garden, and Cornell University. Extensive field studies were 
also carried on in various parts of California, especially in con- 
nection with the polymorphic groups. 
History oF THE GENUS 
The genus Mimulus was first described by Linnaeus! in ‘Acta | 
Upsaliensis’ in 1741. This was followed by another description 
1 Linnaeus, C., Acta Ups. 82. 1741. 
