| 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) | 
