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Asclepias amplexicaulis Sm.
clasping milkweed
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Asclepias exaltata L.
tall milkweed
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Asclepias incarnata ssp. pulchra (Ehrh. ex Willd.) Woodson
downy swamp milkweed
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Asclepias quadrifolia Jacq.
four-leaved milkweed
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Asclepias syriaca L.
common milkweed
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Asclepias tuberosa L.
butterfly milkweed
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Cynanchum louiseae Kartez et Ghandi
= C. nigrum (L.) Pers.
black swallow-wort
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Cynanchum rossicum (Kleopov) Borhidi
pale swallow-wort
