On a County Road in Lee Co that I never traveled before today.
This is var. ferrisiae according to various LRGV references. Abundant and mostly gone to fruit on the stabilized dunes.
Yegua Knobbs Preserve, property of Pines and Prairie Land Trust (No public access)
Chamaecrista fasciculata (Partridge Pea) is a species of legume native to most of the eastern United States. It is an annual which grows to approximately 0.5 meters tall. It has bright yellow flowers from early summer until first frost, with flowers through the entire flowering season if rainfall is sufficient.