⚠ Version 1 of The Plant List has been superseded.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 Osmorhiza longistylis in version 1.1 of The Plant List.
This name is a synonym of Washingtonia longistylis var. brachycoma .
The record derives from Tropicos which reports it as a synonym (record 1702028
) with original publication details: Rhodora 25(295): 110-111 110 1923.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:177057-2
.