| Asclepias | Asclepias amplexicaulis Sm. | clasping milkweed | ME | NH | VT | MA | CT | RI |
| Asclepias exaltata L. | poke milkweed | ME | NH | VT | MA | CT | RI | |
| Asclepias incarnata L. | swamp milkweed | ME | NH | VT | MA | CT | RI | |
| Asclepias purpurascens L. | purple milkweed | ME | NH | VT | MA | CT | RI | |
| Asclepias quadrifolia Jacq. | fourleaf milkweed | ME | NH | VT | MA | CT | RI | |
| Asclepias syriaca L. | common milkweed | ME | VT | MA | CT | |||
| Asclepias tuberosa L. | butterfly milkweed | ME | NH | VT | MA | CT | RI | |
| Asclepias variegata L. | redring milkweed | ME | VT | CT | ||||
| Asclepias verticillata L. | whorled milkweed | ME | VT | MA | CT | RI | ||
| Asclepias viridiflora Raf. | green milkweed | ME | VT | CT | ||||
| Cynanchum | Cynanchum louiseae Kartesz & Gandhi | Louis' swallowwort | ME | NH | VT | MA | CT | RI |
| Periploca | Periploca graeca L. | silkvine | CT | RI |
Last Update: 1/4/97
Name: Ray Phillips
Email: rbphilli@Colby.edu