⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record tro-50067044, with some changes.

Thaspium trifoliatum var. apterum A. Gray is a synonym of Zizia aptera (A. Gray) Fernald

This name is a synonym of Zizia aptera (A. Gray) Fernald.

The record derives from Tropicos which reports it as a synonym (record 50067044) with original publication details: Manual (ed. 2) 156 156 1856.

Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:250922-2.