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Family: Hypericaceae
  Genus: Hypericum

    Hypericum boreale (Britton) E.P.Bicknell*+

        northern St. John's-wort
             Hypericum boreale (Britton) E.P.Bicknell f. callitrichoides Fassett
             Hypericum mutilum L. subsp. boreale
    Hypericum boreale (Britton) E.P.Bicknell X H. majus (A.Gray) Britton+

        
    Hypericum boreale (Britton) E.P.Bicknell X H. mutilum L.+

        
    Hypericum canadense L.*+

        Canadian St. John's-wort, lesser Canadian St. John's-wort
             Hypericum canadense L. var. galiiforme Fernald
             Hypericum canadense L. var. magninsulare Weath.
    Hypericum canadense L. X H. majus (A.Gray) Britton+

        
             Hypericum majus (A.Gray) Britton X H. canadense L.
    Hypericum ellipticum Hook.+

        creeping St. John's-wort, pale St. John's-wort
             Hypericum ellipticum Hook. f. foliosum Vict.
             Hypericum ellipticum Hook. f. submersum Fassett
    Hypericum gentianoides (L.) Britton, Sterns & Poggenb.*+

        orange-grass, pine-weed
             Sarothra gentianoides L.
    Hypericum kalmianum L.*+

        Kalm's St. John's-wort
    Hypericum majus (A.Gray) Britton*+

        larger Canadian St. John's-wort
             Hypericum canadense L. var. majus A.Gray
    Hypericum mutilum L.+

        small-flowered St. John's-wort, weak St. John's-wort
             Hypericum mutilum L. var. latisepalum Fernald
             Hypericum mutilum L. var. longifolium R.Keller
             Hypericum mutilum L. var. parviflorum (Willd.) Fernald
             Hypericum parviflorum Willd.
    Hypericum perforatum L.*+

        common St. John's-wort, Klamath-weed, St. John's-wort
    Hypericum prolificum L.*+

        shrubby St. John's-wort
             Ascyrum spathulatum Spach
             Hypericum spathulatum (Spach) Steud.
    Hypericum punctatum Lam.*+

        spotted St. John's-wort
             Hypericum punctatum Lam. f. subpetiolatum (E.P. Bicknell ex Small) Fernald
             Hypericum subpetiolatum E.P.Bicknell ex Small
    Hypericum pyramidatum Aiton*+

        giant St. John's-wort, great St. John's-wort
             Hypericum ascyron L., misapplied
    Hypericum sphaerocarpum Michx.*+

        round-fruited St. John's-wort, round-seeded St. John's-wort
             Hypericum sphaerocarpum Michx. var. turgidum (Small) Svenson
             Hypericum turgidum Small
    Hypericum X dissimulatum E.P.Bicknell X +

        disguised St. John's-wort
             Hypericum boreale (Britton) E.P.Bicknell X H. canadense L.
             Hypericum dissimulatum E.P.Bicknell
  Genus: Triadenum

    Triadenum fraseri (Spach) Gleason*+
        bog St. John's-wort, Fraser's marsh St. John's-wort
             Elodea fraseri Spach
             Hypericum virginicum L. var. fraseri (Spach) Fernald
             Triadenum virginicum (L.) Raf. subsp. fraseri
             Triadenum virginicum (L.) Raf. var. fraseri (Spach) Cooperr.
    Triadenum virginicum (L.) Raf.*+
        Virginia marsh St. John's-wort
             Hypericum virginicum L.

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