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