The record derives from RJP (data supplied on ) which reports it as a synonym (record 5665) with original publication details: A manual of the flowering plants of California A manual of the flowering plants of California; 1923 479 1925.
⥇ A cross-taxon basionym link was ignored while processing this record, see Spiraea discolor var. glabrescens .
This name record (from RJP) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Holodiscus discolor in version 1 of The Plant List.