In 1941, Wolf (Castanea 6: 24) described a species of yellow Erythronium from Alabama that has a distinctly beaked capsule. In 1963, Parks and Hardin discussed the yellow Erythroniums of eastern United States, recognizing not only the widespread and prevailingly more northern E. americanum Ker (with two subspecies), but also two more southern species, E. umbilicatum Parks and Hardin (with two subspecies) and E. rostratum Wolf. The distribution of E. rostratum as shown by their map, includes stations in the northern half of Alabama and in west-central Tennessee, one in Louisiana, one in south-central Missouri (not mentioned in text), and four “from Arkansas, eastern Oklahoma and southeastern Kansas” which “are tentatively (without fruit) identified as this species,” and suggest “an interesting disjunct distribution.” To this disjunct pattern of distribution must be added stations in western Scioto County, Ohio.