Def. looks like a wild cucumber - check out Google Image search results... Here is a link that might be useful: Google Image search

Jaynine! Bingo! Another site with FL botanists figured it out so I came back to post here. Also known as Four Leaf vetch, even though mine has two, sometimes three. It spits seeds like crazy! It has set up shop in my landscaping that borders my neighbor's ornamentals. I've been looking into an herbicide that won't kill my and my neighbor's plants. There's asiatic jasmine ground cover, euonymus, Drift roses, crape myrtles and ligustrum. I am thinking of using the clopyralid Transline but if you know of a less expensive control, I'd sure appreciate it.

Just one final comment then debg; Milestone is "the other" too-persistent herbicide. What I mean by that specifically is, both of these compounds have the ability to remain active right through a composting program. Thus, grass clippings which have been treated with either, and which subsequently end up in one of these municipal composting programs, can and do go on to kill plants in gardens wherever that compost ends up. Talk about unintended consequences! All that said, our native landscaping contractor, who is retained to do work in our numerous stormwater properties, uses both, mainly for extra-tough weeds, things like thistles and yup-vetches. So your game plan is sound, since I see no reason why this persistence will end up anywhere you don't want it. These are hot materials, so to speak, for when you need that extra oomph. Your situation is one such example. +oM

Found! It's a Vicia acutifolia, commonly known as Four-leaf vetch (even though it usually only has two!)