| Name | Porophyllum ruderale subsp. macrocephalum (de Candolle) R. R. Johnson |
| Authorship | (de Candolle) R. R. Johnson |
| Rank | Subspecies |
| Placed in | Porophyllum ruderale (Jacquin) Cassini |
| Citation | 1969 Univ. Kansas Sci. Bull. 48(7): 233 |
| Holdings | 4 Specimens held in the Harvard University Herbaria identified as Porophyllum ruderale subsp. macrocephalum (de Candolle) R. R. Johnson |
| Identification made in | [no date] (3), 1964 (1) |
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