Icacinicarya jenkinsi is known from a small, slender fruit cavity whose walls carried unusually large inward-projecting structures. The locule cast records broad conical tubercles, apparently arranged fairly regularly and probably in longitudinal series. Between them the inner wall is distinctly papillate. This combination gives the species a very different internal texture from ordinary ridged Icacinicarya stones.

Modern authors noted a strong resemblance to fruits of the living genus Miquelia, but the external endocarp surface is not preserved well enough to make a formal transfer. The species therefore remains in Icacinicarya. This is a useful example of a fossil whose closest biological comparison is suggestive but incomplete: the reproductive anatomy indicates an icacinaceous lineage and possible Miquelia relationship, while the whole-plant habit and exact generic placement remain inference.