⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record tro-2605139, with some changes.

Xysmalobium rigidum (E. Mey.) D. Dietr. is a synonym of Asclepias rigida (E.Mey.) Schltr.

This name is a synonym of Asclepias rigida (E.Mey.) Schltr..

The record derives from Tropicos which reports it as a synonym (record 2605139) with original publication details: Syn. Pl. 2: 902 902 1840.

Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:103140-1.