FWIW, I ran into the A. trilobata/A. triloba issue recently, as I had received some seed in a trade and researching pics/info became confusing. I did a check, and A. triloba is a synonym (misspelling) of A. trilobata.
See
http://www.theplantlist.org/tp....
Melanie, in looking at your caterpillar pics, trying to get a handle on the difference between the Pipevine and the Gold Rim, I noticed a gold ring behind the head of the Gold Rim caterpillar. Is this a diagnostic feature? Just curious for now, as I don't have any pipevine plants growing yet.
I have four types of seed to play with: A. trilobata, A. fimbriata, A. macrophylla, and A. gigantea. Now that I know the issues with A. gigantea, I will probably only grow it once, just to see the flowers. If I had realized what I was getting I probably wouldn't have requested any of the seed, as I was having a brain-lapse at the time and thought I was getting seed of different types of Nepenthes (Pitcher Plant vines), which I really wanted.
I'm glad I have the pipevine types to fiddle with for a bit, but will likely only keep those good for our butterflies, and only then if I can naturalize them on the property away from the house. Away from the house, not so much because of any smell, but so I can just let the caterpillars have at them without worrying about ugly plants.
I am also curious about the Tropical Milkweed. Why did you rip it out?
