| Name | Petrophytum cinerascens (Piper) Rydberg |
| Authorship | (Piper) Rydberg |
| Rank | Species |
| Placed in | Petrophytum |
| Holdings | 6 Specimens held in the Harvard University Herbaria identified as Petrophytum cinerascens (Piper) Rydberg |
| Identification made in | [no date] (6) |