TY for the suggestion. That's Hypericum? Only seeing 5-petal flowers in an image search of that genus name.

Hypericum hypericoides?

There are at least two Hypericum species with 4 petals. H. hypericoides (St. Andrew's-cross) has inner sepals that are minute, to obsolete. H. crux-andreae (St. Peter's-wort) has inner sepals that are smaller than the outer ones, but easily noticed. Your plant is Hypericum crux-andreae.

TY very much for the replies! Yellow flowers confuse the heck out of me. Looks like a match, Jekeesl, another native.

http://plants.usda.gov/core/profile?symbol=HYCR3

In Arkansas, H. crux-andreae tends to be found where some of our more rare, native species exist. I always look an area over more carefully when I find that plant.

Fantastic tip, TY so much! So, does that imply the species of this discussion is a less common plant to find, or just about the company it often keeps? This spot is alongside a dirt road, that's even more rural than most
unpaved roads, kind of a low spot, a little more moist than most. Last year I heard a wild boar when I got out of my car in that spot, just far enough away through the dense foliage that I couldn't see it, but sounded like it was only a few feet away. I'm always looking for snakes & alligators, but that creeped me out.

Weakley's key says the species is usually found in "pine flatwoods, pine savannas, bogs, seeps, mesic to dryish forests and woodlands". Bogs and seeps are always special places. The rest, in Arkansas, often come with sandy soils, which is usually found in the Gulf Coastal Plain. That region supports many interesting plants, such as Croptilon divaricatum, Schizachyrium scoparium var. divergens (a very hairy variant with the common name of Pinehill bluestem), Decodon verticillatus, Xyris ambigua, Lithospermum caroliniense, Erythronium albidum, and Aristida lanosa.

IDK what any of those are there at the end, but I'm sure they are lovely, and hope to spot them out there sometime. TY so very much for the added info!