Synonyms: Croton albescens; Croton incanus (heterotypic); Croton incanus var. microphyllus; Croton macraei; Croton rivinaefolius var. albescens; Croton rivinifolius var. albescens; Croton scouleri f. glabriusculus; Croton scouleri f. incanus; Croton scouleri f. macraei; Croton scouleri f. microphyllus; Croton scouleri f. verus; Croton scouleri var. albescens; Croton scouleri var. castellanus; Croton scouleri var. glabriusculus; Croton scouleri var. incanus (heterotypic); Croton xalapensis (heterotypic)