| Name | Porophyllum tridentatum var. crassifolium (Watson) I. M. Johnston |
| Authorship | (Watson) I. M. Johnston |
| Rank | Variety |
| NomenclaturalStatus | Unknown |
| Placed in | Porophyllum tridentatum Bentham |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Porophyllum tridentatum var. crassifolium (Watson) I. M. Johnston |
| Identification made in | 1964 (1) |
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