I planted 3 plugs in the spring of Southern Blue Monkshood, Aconitum uncinatum. One kept getting dug up by the wildlife and died. Another is still alive but got nibbled off at the tip, so it's stopped growing. The last impresses me the most though as it's only reach 1' tall and decided to flower.
Nonnative Monkshoods are more commonly sold. They're not vines or brambles though, but rather up right perennials on par with a snapdragon or lupine. It seems our natives are the only ones that grow to be semi-vines. They're a real treat to have because the foliage stays hidden for most of the year. Our natives are not widely sold but I got mine from Toadshade Wildflower Farm, direct link.