| Name | Polygonum douglasii subsp. johnstonii (Munz) J. C. Hickman |
| Authorship | (Munz) J. C. Hickman |
| Rank | Subspecies |
| Placed in | Polygonum douglasii Greene |
| Citation | 1984 Madroño 31: 250 |
| Holdings | 4 Specimens held in the Harvard University Herbaria identified as Polygonum douglasii subsp. johnstonii (Munz) J. C. Hickman |
| Identification made in | [no date] (3), 2003 (1) |
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