For the long-term loan of a number of selected specimens, particularly of the genus Aster, I am indebted to Dr. Robert E. Woodson, Jr., of the Missouri Botanical Garden, and to Dr. Reed C. Rollins, of the Gray Herbarium. When not otherwise stated, types and cited specimens in the following notes are in the Herbarium of Southern Methodist University.
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Shinners, Lloyd H.
"Notes on Texas Compositae – IX,"
Field and Laboratory: Vol. 21
Available at: https://scholar.smu.edu/fieldandlab/vol21/iss4/8