For Sclerocarpus
Feddema, C. 1972. Sclerocarpus uniserialis (Compositae) in Texas and Mexico. Phytologia 23: 201-209. Google Scholar
Harriman, N.A. 2006b. Sclerocarpus. In Flora of North America Editorial Committee. 2006c. Flora of North America north of Mexico. Volume 21, Magnoliophyta: Asteridae, part 6: Asteraceae, part 3. Oxford Univ. Press, New York, NY. 616 pp. Google Scholar
Turner, B.L. 1988. A new variety of Sclerocarpus uniserialis (Asteraceae, Heliantheae) from southernmost Texas. Phytologia 64: 341-343. Google Scholar
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