| Vernonia obtusa (Gleason) S.F. Blake, 1926 |
| Vernonia obtusa subsp. bartlettii S.B. Jones, 1973 |
| Vernonia obtusa subsp. parkeri S.B. Jones, 1973 |
| Vernonia obtusa var. bartlettii (S.B. Jones) B.L. Turner, 1989 |
| Vernonia obtusa var. obtusa (Gleason) S.F. Blake, 1926 |
| Vernonia obtusa var. parkeri (S.B. Jones) B.L. Turner, 1989 |
| Vernonia occulta Redonda-Mart. & Mora-Jarvio, 2017 |
| Vernonia oolepis S.F. Blake, 1917 |
| Vernonia pacchensis Benth., 1844 |
| Vernonia pacchensis var. tambillensis Hieron., 1905 |
| Vernonia pallens Sch. Bip., 1861 |
| Vernonia palmeri Rose, 1891 |
| Vernonia paniculata DC., 1836 |
| Vernonia patens Kunth, 1818 |
| Vernonia poeppigiana DC., 1836 |
| Vernonia polypleura S.F. Blake, 1938 |
| Vernonia pooleae B.L. Turner, 1981 |
| Vernonia pugana S.B. Jones & Stutts, 1981 |
| Vernonia purpurascens Sch. Bip. ex Walp., 1843 |
| Vernonia purpusii Brandegee, 1915 |