⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record kew-2573541, and has not been changed.

Polygonum sawatchense Small is a synonym of Polygonum douglasii subsp. johnstonii (Munz) J.C.Hickman

This name is a synonym of Polygonum douglasii subsp. johnstonii (Munz) J.C.Hickman.

The record derives from WCSP (in review) which reports it as a synonym with original publication details: Bull. Torrey Bot. Club 20: 213 1893.

Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:206402-2.