Supplementary List of Illinois Vascular Plants

Abstract

This list comprises twenty-eight species of vascular plants that were not included in the Flora of Illinois, published in 1945. From a phytogeographical standpoint it contains two classes of plants, some that are adventive weeds and garden escapes, and others that are native, mostly rare species, such as Bergia texanac, Echinodorus tenellus, Heteranthera limosa, Scirpus hall/i, and Spiranthes lucida. Some of these have not been seen in Illinois for more than half a century, and may perhaps have become extinct here. Unless otherwise indicated, the specimens are in the herbarium of the University of Illinois. For opportunity of checking various specimens, thanks are due Drs. J. M. Greenman of Missouri Botanical Garden, E. J. Palmer of Arnold Arboretum, P. C. Standley and J. A. Steyermark of Chicago Natural History Museum, H. K. Gloyd of Chicago Academy of Sciences, L. R. Tehon of Illinois Natural History Survey, V. H. Chase of Peoria Academy of Science, and George D. Fuller of Illinois State Museum at Springfield.