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This might be a disjunct population of Silphium albiflorum x laciniatum, near the AR/OK state line. There were about 100 plants at the roughly 2-acre site. They were growing in a sunny shale glade and were growing with Grindelia lanceolata, Ambrosia bidentata, Eupatorium serotinum, Schizachyrium scoparium, Ruellia humilis, Crocanthemum rosmarinifolium, Tridens strictus, Asclepias hirtella, Boltonia diffusa, and Oenothera filiformis.

Flowering specimens averaged 60 cm tall, with the smallest one 30 cm tall and the largest one 85 cm tall. Leaf tips were acuminate to apiculate. Calyx lobes were stipitate-glandular. All of the flowers had very pale yellowish-green ligules (9-19 per head) that were mostly less than 2.5 cm long. Disc florets were lemon-yellow as shown.

We were later told that the adjacent McCurtain County, OK has a couple of similar populations on prairie glades.

Comparison of five species of Dichanthelium, from left to right: D. sphaerocarpon, D. boscii, D. commutatum var. commutatum, D. commutatum var. ashei, D. dichotomum var. dichotomum.

Images compare the spikelets, lowest node, widest leaf, and overall habit.

About a dozen Chamaecrista in very sandy soil on an oxbow of the Red River.  These plants were from a single, thick stem, were widely branched and were 24-30 inches tall.  They were just starting to flower. The branches were red on one side, green on the other, and the red sides were moderately covered with hairs that curled back toward the branch.  My photos show the entire plant, but don't show lower stems which were thick, textured, and grayish. Photos of the lower stem can be seen here: https://www.inaturalist.org/observations/232882783.