Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Pseudomonadati (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Pseudomonadotaᵀ Garrity et al. 2021
                 Class Alphaproteobacteria Garrity et al. 2006
                   Order Hyphomicrobiales Douglas 1957 (Approved Lists 1980)
                     Family Hyphomicrobiaceaeᵀ Babudieri 1950 (Approved Lists 1980)
                       Genus Hyphomicrobiumᵀ Stutzer and Hartleb 1899 (Approved Lists 1980)
                         Hyphomicrobium facile corrig. Hirsch 1989
                           1 Hyphomicrobium facile subsp. facileᵀ corrig. Hirsch 1989
                           2 Hyphomicrobium facile subsp. tolerans corrig. Hirsch 1989
                           3 Hyphomicrobium facile subsp. ureaphilum corrig. Hirsch 1989