Hackelia diffusa var. caerulescens (Rydb.) I.M.Johnst. Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Boraginales family Boraginaceae genus Hackelia species Hackelia patens Name Homonyms Hackelia diffusa var. caerulescens (Rydb.) I.M.Johnst.