| Megaliabum Rydb., 1927 |
| Megaliabum andrieuxii (DC.) Rydb., 1927 |
| Megaliabum pringlei (B.L. Rob. & Greenm.) Rydb., 1927 |
| Melampodiinae Less., 1830 |
| Melampodium L., 1753 |
| Melampodium achillioides (Less.) Hemsl., 1881 |
| Melampodium americanum L., 1753 |
| Melampodium appendiculatum B.L. Rob., 1901 |
| Melampodium arenicola B.L. Rob., 1901 |
| Melampodium argophyllum S.F. Blake, 1924 |
| Melampodium arvense B.L. Rob., 1901 |
| Melampodium aureum Brandegee, 1910 |
| Melampodium bibracteatum S. Watson, 1891 |
| Melampodium bonairense Bold., 1914 |
| Melampodium brachyglossum Donn. Sm., 1888 |
| Melampodium canescens Brandegee, 1905 |
| Melampodium cinerascens S.F. Blake, 1924 |
| Melampodium cinereum DC., 1836 |
| Melampodium cinereum var. cinereum DC., 1836 |
| Melampodium cinereum var. hirtellum Stuessy, 1969 |