⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record kew-339502, with some changes.

Tithymalus arkansanus var. coloradensis (Norton) Rydb. is a synonym of Euphorbia spathulata Lam.

This name is a synonym of Euphorbia spathulata Lam..

The record derives from WCSP which reports it as a synonym (record 339502) with original publication details: Bull. Torrey Bot. Club 33: 145 1906.

Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:254770-2.