Synonyms
Xanthisma spinulosum var. paradoxum (B.L.Turner & R.L.Hartm.) D.R.Morgan & R.L.Hartm.
Haplopappus spinulosus var. paradoxus (B.L.Turner & R.L.Hartm.) Cronquist
Machaeranthera pinnatifida var. paradoxa B.L.Turner & R.L.Hartm.
Xanthisma paradoxum (B.L.Turner & R.L.Hartm.) G.L.Nesom & B.L.Turner