Well, I discovered the vine I loved so much at the US Botanical Gardens in WDC was a Hardenbergia violacea--now I HAVE to have one (to grow as an annual of course). Now...how do I find one or seeds to grow one?
There's a few people on Ebay offering seeds.
Hi try JL Hudson, they have a lot of unusual vine seeds.
Here is a link that might be useful: J L Hudson