Could be a Senna/Cassia like Joe mentioned, or maybe a black or honey locust? Kind of hard to tell at such a young stage, but if I had to choose I would lean toward Senna or Cassia rather than a locust...

It occurs to me that this discussion probably should be on the trellis thread, but since the OP did mention support... ..."With plastic I would have to untangle the vines from the plastic in order to leave the plastic in place... ...If I understand correctly, you tried that and it took too much time." Although I do not leave my trellises up from year to year, I did try to recycle the twine once, as well as to leave all vines in the garden to be tilled under. If the vines were left on over Winter, they were dry & brittle by the time I removed them in Spring. I would cut the bottom of the vertical string, cut the base of the vine, and cut any tops that had grown beyond the trellis. Most of the time, I could then pull from the top down, and the vines would slide off. It took practice, and some varieties were more difficult to remove than others. But in the end, with the wife & I both removing the vines, it took several days. The weather is fickle here, and I don't usually get the luxury of that much time; so I decided that my time was worth more than the cost of the twine. I've actually been wanting to change my trellis system, to reduce the time I spend each year erecting them. I have thought about 5' tall concrete remesh, cut into 5' & 10' lengths & attached to the poles with zip ties. The different lengths would be combined as needed depending upon trellis length. I already use zip ties for attaching the bottom support, so I know they hold up pretty well. SSE uses basically the same system on their farm, where they use thousands of feet of trellis. But there are two drawbacks. The first is that to get the lengths of remesh I need, I would need to cut my own from the 150' rolls. Sounds easier than it really is. The wire is fairly heavy gauge, and after you cut it, you then need to bend it straight... which is also difficult & time consuming. I have 2 rolls now, and might get this done eventually... but it will be a lot of hard work to turn those rolls into flat panels. The other problem with using steel for the trellises (whether remesh, fencing, or cattle panels) is the storage issue. Because of my crop rotation, the trellises will be in different places each year & must be removed before Spring for tilling. As it is, after Spring cleaning, I have to make piles of poles & rebar rod off to the side of the garden. That much remesh (or steel fencing), when stacked off to the side, would be a real eyesore. My main garden is on a friend's property, so that is out of the question. "No one has mentioned trellis netting & it works well and lasts several years, though I am not doing long runs as some are." I considered it in the past, but found it cost prohibitive. Also, although it might last several years, you have to clean all of the debris out of it after the first year in order to reuse it. While that might work for small runs, it would be nearly impossible to clean off 100' or more in a reasonable amount of time. Oh, and on the topic of cleaning trellis material, there is an easy way to clean old vines from wire fencing. Just roll up the fence - vines & all - when everything has dried, and (in a safe place) set fire to it. Presto! no more vines. Cool, unroll, and reuse.

Different varieties show different degrees of heat tolerance. Generally, Rattlesnake is known for heat resistance. I grow Tennessee Cutshort, which does alright into the low to middle 90s. But we've been experiencing triple digit temperatures, often to 106 F, for weeks now, and Tennessee Cutshort appears to be waiting for cooler temps. I wonder about Blue Marbut. Being from Alabama, it might be heat resistant. George Tahlequah, OK Here is a link that might be useful: Sandhill Preservation Center Beans

Here's a picture of a few of the Insuk's Wang Kong beans I saved for seed this year, when they were completely dry most of them measured about an inch in length. These are the two color pattern mine produced, they're a slightly darker mauve than this picture shows. As others have said your beans are definitely runner beans, but which variety there's quite a few. Insuk's Wang Kong's flowers are red but so are some of the other varieties, there are also runners with white flowers, some with salmon colored flowers and there's some with red and white bicolored flowers, the seed coats also come in slightly different colors, with spotted or laced patterns and some are a solid color. In any case be sure to keep us posted on how your beans on steroids do :). Annette