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 Polygonales Dumort. (1829) see Order Caryophyllales Juss. ex Bercht. & J.Presl (1820)
           Family Polygonaceae Juss. (1789), nom. cons. - buckwheat family
             Genus Polygonum L. (1753) - knot grass
               Polygonum lapathifolium L. - curltop ladysthumb
                 1 Polygonum lapathifolium subsp. lapathifolium L.
                 2 Polygonum lapathifolium subsp. pallidum (With.) Fr.
                 3 Polygonum lapathifolium subsp. mesomorphum (Danser) Danser
                 4 Polygonum lapathifolium subsp. brittingeri (Opiz) Jáv.