⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record kew-135080, with some changes.
This name is a synonym of Pycnanthemum flexuosum (Walter) Britton, Sterns & Poggenb..
The record derives from WCSP which reports it as a synonym (record 135080) with original publication details: Sp. Pl. 571 1753.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:452819-1.