Amaranthus retroflexus f. rubricaulis Thell. Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Caryophyllales family Amaranthaceae genus Amaranthus species Amaranthus retroflexus Name Homonyms Amaranthus retroflexus f. rubricaulis Thell. ex Probst Amaranthus retroflexus var. rubricaulis Thell. Amaranthus retroflexus f. rubricaulis Thell.