Polygonum douglasii subsp. johnstonii (Munz) J.C. Hickman

Polygonum douglasii subsp. johnstonii (Munz) J.C. Hickman is a synonym sensu FNA Ed. Comm., 2005 of:

Polygonum sawatchense Small subsp. sawatchense, an accepted subspecies name sensu FNA Ed. Comm., 2005.