Synonyms: Cacalia interjecta; Cacalia megapotamica; Stenocephalum breviflorum; Stenocephalum brevifolium; Stenocephalum hexanthum var. hexanthum; Stenocephalum melanotrichium; Stenocephalum penicillatum; Vernonia carbonaria (homotypic); Vernonia megapotamica; Vernonia megapotamica f. megapotamica; Vernonia megapotamica hexantha; Vernonia megapotamica megapotamica; Vernonia megapotamica var. argentina; Vernonia megapotamica var. brevifolia; Vernonia megapotamica var. megapotamica; Vernonia megapotamica var. melanotrichia; Vernonia megapotamica var. penicillata; Vernonia melanopappa (homotypic); Vernonia nigrescens (homotypic)