Crataegus crus-galli var. nana G.Nicholson Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Rosales family Rosaceae genus Crataegus species Crataegus crus-galli Name Homonyms Crataegus crus-galli var. nana (Dum.Cours.) DC. Crataegus crus-galli var. nana G.Nicholson ex Rehder Crataegus crus-galli f. nana Poletiko Crataegus crus-galli var. nana G.Nicholson