Flora van Nederland Haeckel (1866) - plants
   Division Spermatophyta Goebel (1882) see Phylum Spermatophyta Goebel (1882)
     Subdivision Gymnospermae see Infraphylum Gymnospermae auct.
       Class Coniferopsida see Class Pinopsida Burnett (1835)
         Order Coniferales see Order Pinales Dumort. (1829)
           Family Pinaceae Spreng. ex F.Rudolphi (1830), nom. cons. - pine family
             Genus Tsuga (Endl.) Carrière (1855)
               1 Tsuga heterophylla (Raf.) Sarg. - western hemlock
               2 Tsuga canadensis (L.) Carrière (1855) - Canada hemlock