⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record tro-5107971, with some changes.

Melocactus obtusipetalus var. crassicostatus (Lem.) Lem. ex Miq. is a synonym of Melocactus curvispinus Pfeiff.

This name is a synonym of Melocactus curvispinus Pfeiff..

The record derives from Tropicos which reports it as a synonym (record 5107971) with original publication details: Monogr. Melocacti 56 56 1840.