Senna silvestris

Senna silvestris is a tropical American shrub or small tree of the Fabaceae (subfamily Caesalpinioideae) native to lowland and submontane forests from Mexico and Central America through Amazonia to northern South America. Plants typically reach 3 to 10 m in height with smooth, greyish bark and spreading branches. The leaves are alternate and pinnately compound with several pairs of opposite, lanceolate to oblong leaflets bearing an acuminate apex; conspicuous extrafloral nectaries are usually present on the rachis between the lower leaflet pairs. Flowers are showy, bright yellow, with five somewhat unequal petals and ten stamens of differing sizes, arranged in axillary or terminal racemes. The fruit is an elongate, flattened, dehiscent legume containing numerous flat seeds. It typically flowers and fruits during the wet season in moist forest and forest edges.