Hmmm... Doesn't jewel weed have WAXY water repellent cotyledons? I mean it's entirely possible. I leaned over a culvert 6 feet above the water to collect a few seeds a few years ago and their offspring have been going to town in my garden.
I do love that the bumblebees and hummingbirds absolutely go nuts over the flowers.
My kids think they are a blast when the seeds start shooting and collect them and toss them around.... For all I know, that's what they did last fall

This would explain the clusters, too.