Unknown species or variety?

Multiple plants by roadside. Other similar populations present in the County, usually on disturbed land.

Unfortunately, they have been cut back down multiple times by road maintenance crews, but the largest I've seen, so far, is about 9 ft. tall. I believe they have potential to make a small tree, but they seem to stay more shrubby when given space. Even when less than tree size, they have an arborescent form with a single stem and branching crown.

Appear to be R. hispida or R. viscosa, but no sign of bristles or viscid glands anywhere on any plant.

Leaves have short non-glandular pubescence, but this is shed until entirely glabrous after spring.

Peduncles appear to have glandular and non-glandular hairs, but they aren't resinous or sticky.

I have yet to observe any plant set fruit.

Spines resemble the narrow cylindrical form of R. hispida rather than the broadly tapered form of R. pseudoacacia, and they're reliably present at each node.

R. hispida does occur wild nearby. It is typically a smaller shrub with fewer flowers, and it exhibits the expected bristles that persist on the stems for multiple years.

The closest description I've found is for R. boyntonii, but that was relegated to a synonym for R. hispida var. rosea by a big revision of the Robinia genus. However, I can find no record of R. hispida var. rosea lacking the species's characteristic bristles. Furthermore, R. hispida var. rosea is supposed to lack regular spines at the nodes, but this plant is very regular with the spines.

Seems very similar to A. fasciculata, but leaves are longer, more spreading. While most A. fasciculata in the area are just finishing flowering, this plant appears to only be beggining. Found in wet lowland in shady area besides creek, while A. fasciculata seems more common in drier, sandier, sunnier habitats. The leaf fascicles are always shorter than the leaves, by half or less, rather than being nearly the same length. However, the leaf fascicles appear more numerous than is regular for A. purpurea, so I am less than confident in this ID.

Taxon is apparently the recently rediscovered Hypericum splendens,. However, H. splendens was previously relegated to a synonym of H. frondosum, and so it is currently unavailable in iNaturalist database.