Josephine, what a nice article about Climbing Milkweed Vine (Funastrum cynanchoides) Anything we can do to help the Monarch's and other butterflies is a good thing. I think I might have to give this one a try!

Are there any sources for plants or seeds of this vine?

Thank you Lin, I feel very strongly about helping the butterflies.

Lin and Cali, I am sorry that I don't directly know of sources for this plant. My plant was given to me by a friend, and it has done very well, but so far it has not produced any seeds, I think it needs cross pollination to set seed.
So far I have only been able to propagate it by cuttings. Maybe it will eventually set seed, we shall see.