Flora van Nederland Haeckel (1866) - plants
   Division Spermatophyta Goebel (1882) see Phylum Spermatophyta Goebel (1882)
     Subdivision Angiospermae J. Lindley (1830) see Infraphylum Angiospermae auct.
       Class Dicotyledones see Class Magnoliopsida Brongn. (1843)
         Order Campanulales Juss. ex Bercht. & J.Presl (1820) see Order Asterales Link (1829)
           Family Compositae Giseke (1792), nom. cons.
             Genus Lactuca L. (1753)
               1 Lactuca tatarica (L.) C.A.Mey. - blue lettuce
               2 Lactuca saligna L. - willowleaf lettuce
               3 Lactuca sativa L. - garden lettuce
               4 Lactuca serriola L. - China lettuce
               5 Lactuca virosa L. - bitter lettuce