Houstonia purpurea f. purpurea Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Gentianales family Rubiaceae genus Houstonia species Houstonia purpurea Name Homonyms Houstonia purpurea var. purpurea Houstonia purpurea f. purpurea