Senna reniformis can be easily identified by its arboreal habit, leaves with 3-4 pairs of leaflets, subreniform stipules, acuminate-caudate apex,
amplexicaul, subcordate-subauriculate base and extrafloral nectaries located between all pairs of leaflets and the pedicels of the flowers.
Leaves pinnately veined, pubescent; basal leaves rosulate to sub-rosulate; decurrent to
amplexicaul; blades linear to oblong, pinnately lobed to pinnately partite, auriculate at the base, margin spiny to unarmed; upper leaves alternate, similar to the basal leaves but reduced.
Basal leaves absent; cauline leaves numerous, sessile, often fleshy and becoming leathery upon drying, petiolate or sessile and auriculate or not at base, rarely sagittate or
amplexicaul, entire or coarsely dentate, rarely pinnatisect, reticulately veined.
Leaves sessile, at least upper ones auriculate to
amplexicaul; septum absent; filaments glabrous S.