Abstract
Previously unreported counts an 40 weil differentiated species or varieties of the Polemoniaceae are given. Included with these is a general account of all chromosome numbers reported for species of this family to date. This is followed by a summary of chromosome size, chromosome morphology, and the different cytological groups observed. There is a discussion an the taxonomic grouping implied by the cytological facts.
The author wishes to thank Professor Orland E. White and Professor Edgar T. Wherry for gifts of materials, and for their interest in this work. To Professors E. T. Wherry, Karl Sax, and S. H. Yarnell grateful acknowledgement is made for their critical reading of the manuscript.
This study was begun at the Blandy Experimental Farm of the University of Virginia, and was continued while the writer was a Fellow of the National Research Council at Harvard University.
