Within the Ohio Valley, this northeastern hexaploid (2n = 54) is virtually unknown west of the Appalachians, except for an extension in ravines downstream to the western Knobs (K). Identity of the few populations along the Ky. Rv. Palisades remains uncertain; see notes under macrophylla. Cr noted that schreberi may have originated through hybridization between macrophylla (2n = 72) and divaricatus (2n = 18). E. schreberi differs from typical macrophylla in its pure white flowers (versus usually pale to deep lavendar, bluish or violet), and its glandless to sparsely glandular phyllaries and inflorescence branches (versus densely glandular). Upper leaf surfaces are eglandular and glabrous to sparsely villous above (versus glandular and scabrous but highly variable); well-developed basal leaves have a broad, nearly rectangular sinus (versus more rounded). Both species often spread clonally in the shade, with little or no flowering.