Sesbania punicea, not a native plant.

Here is a link that might be useful: Sesbania punicea

Sesbania vesicari is a native species in the same genus, not sure how you tell them apart.

Weakley's key predicts leaves with 10-20 pairs of leaflets for S. punicea, and 8-13 pairs of leaflets for S. versicaria. If the plant in the photo is one of these two, then it may be S. punicea.

I didn't have time earlier for a longer note, but did want to show photos from yesterday's walk. This is Sesbania versicaria, which is a tall, weedy plant with red and yellow flowers and flat legumes. Sesbania punicea is more shrub-like, with redder flowers and 4-angled legumes. I thought the op could use these for comparison.

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