Sium pusillum Nutt. ex Torr. & A.Gray Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Apiales family Apiaceae genus Berula species Berula erecta Name Homonyms Sium pusillum Nutt. Sium pusillum Poir. Sium pusillum Nutt. ex Torr. & A.Gray