Houstonia latifolia Willd. ex Roem. & Schult. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Gentianales family Rubiaceae genus Houstonia species Houstonia purpurea Name Homonyms Houstonia latifolia Willd. ex Roem. & Schult. Houstonia latifolia Willd.