⚠ Version 1 of The Plant List has been superseded.
This name record (from Tropicos) is not included in version 1.1 of The Plant List. It is possible the same name is included from a different data source, to check this you can search for Spiraea douglasii in version 1.1 of The Plant List.
This name is a synonym of Spiraea douglasii subsp. menziesii .
The record derives from Tropicos which reports it as a synonym (record 27801439
) with original publication details: Abh. Königl. Böhm. Ges. Wiss., ser. 5 6: 555 555 1851.