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Family: Asclepiadaceae
  Genus: Asclepias

    Asclepias amplexicaulis Sm.*+
        clasping milkweed, sand milkweed
    Asclepias exaltata L.*+
        poke milkweed, tall milkweed
             Asclepias bicknellii Vail
             Asclepias phytolaccoides Pursh
    Asclepias hirtella (Pennell) Woodson*+
        prairie milkweed, tall green milkweed
             Acerates hirtella Pennell
             Asclepias longifolia Michx. var. hirtella (Pennell) Farmer & Bell
    Asclepias incarnata L.
        swamp milkweed
    Asclepias incarnata L. subsp. incarnata*+
        swamp milkweed
             Asclepias incarnata L. var. incarnata
    Asclepias lanuginosa Nutt.*+
        side-cluster milkweed, woolly milkweed
             Acerates lanuginosa (Nutt.) Decne.
             Acerates monocephala Lapham ex A.Gray
             Asclepias nuttalliana Torr.
             Asclepias otarioides auct. non E.Fourn.
    Asclepias meadii Torr. ex A.Gray*+
        Mead's milkweed
    Asclepias ovalifolia Decne.*+
        dwarf milkweed, oval milkweed, oval-leaved milkweed
    Asclepias purpurascens L.*+
        purple milkweed
    Asclepias speciosa Torr.*+
        showy milkweed
    Asclepias sullivantii Engelm. ex A.Gray*+
        prairie milkweed, smooth milkweed, Sullivant's milkweed
    Asclepias syriaca L.*+
        common milkweed, silkweed
             Asclepias intermedia Vail
             Asclepias kansana Vail
             Asclepias syriaca L. var. kansana (Vail) E.J.Palmer & Steyerm.
    Asclepias tuberosa L.
        butterfly milkweed, butterfly-weed, orange milkweed
    Asclepias tuberosa L. subsp. interior*+
        butterfly milkweed, butterfly-weed, orange milkweed
             Asclepias tuberosa L. subsp. terminalis
             Asclepias tuberosa L. var. interior (Woodson) Shinners
    Asclepias verticillata L.*+
        whorled milkweed
    Asclepias viridiflora Raf.*+
        short green milkweed
             Acerates viridiflora (Raf.) Pursh ex Eaton
             Acerates viridiflora (Raf.) Pursh ex Eaton var. ivesii Britton
             Acerates viridiflora (Raf.) Pursh ex Eaton var. linearis A.Gray
             Asclepias lanceolata Ives
             Asclepias viridiflora Raf. var. lanceolata (Ives) Torr.
             Asclepias viridiflora Raf. var. linearis (A.Gray) Fernald
  Genus: Vincetoxicum

    Vincetoxicum nigrum (L.) Moench*+
        black swallow-wort
             Asclepias nigra L.
             Cynanchum louiseae Kartesz & Gandhi
             Cynanchum nigrum (L.) Pers.

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