Abstract
According to Pfeiffer (1922), Isoetes butleri Engelm. occurs in Tennessee, Missouri, eastern Kansas and south into Arkansas and Oklahoma. In Tennessee, I. butleri is restricted to cedar (limestone) glades of the Central Basin, where the soil is water-logged during winter and early spring but may be extremely dry during late spring, summer, and autumn. The University of Tennessee and Vanderbilt herbaria have specimens of I. butleri from Bedford, Davidson, Maury, Rutherford, Williamson, and Wilson Counties. In addition, we have found the species in Marshall County on 7 May 1977, along State Road 99, 6.5 miles west of U.S. highway 31 A (J. & C. Baskin 1895, VDB). All of the above collections were from cedar glades.
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