Chapm. (A.Gray) 1978 - Chapman GC, Jones SB (1978) BIOSYSTEMATICS OF THE TEXANAE VERNONIAS (VERNONIEAE: COMPOSITAE). Sida, Contributions To Botany 7(3): 264-281. Retrieved from http://www.jstor.org/stable/41967385
There is no corrections for Vernonia greggii subsp. ervendbergii yet.