round-leaf cassia

Chamaecrista rotundifolia is a herb with pilose branches and inermous stems. It lacks nectaries and has lateral stipules that are ovate in shape. The leaves are paripinnate and typically bifoliolate, with opposite, obovate leaflets and actinodromous venation. The inflorescence is cymose and axillary, bearing pedicellate, asymmetrical flowers with a yellow dialypetalous corolla and five petals. The androecium is dialystaminous and homodinamous, with longitudinal anthers. The ovary is superior, sessile, and pluriovulate. The fruit is a linear, plane legume with a glabrous, brown epicarp. The seeds are trapezoidal, plane, with a black coat and a basal hilum.

Chamaecrista rotundifolia is primarily found in campo rupestre vegetation, a type of high-altitude, rocky savanna ecosystem. It is commonly observed in regions such as the Itacolomi State Park in Brazil, as well as in other parts of South America, including Colombia and Argentina. This plant thrives in semi-arid and tropical environments, often in open or disturbed habitats where it can take advantage of available sunlight and well-drained soils.

While not widely cultivated, Chamaecrista rotundifolia has potential for use in pasture systems due to its ability to grow in poor soils and its nitrogen-fixing properties. It is often found in natural pastures and can be used as a forage plant in tropical and subtropical regions. Its cultivation is typically limited to areas where it occurs naturally, and it is more commonly managed in conservation and ecological restoration projects rather than in agricultural settings.

Chamaecrista rotundifolia is primarily valued for its ecological role in maintaining soil stability and biodiversity in campo rupestre and other open habitats. It is also used as forage in some regions, particularly in tropical pastures, where it contributes to livestock feed. Its nitrogen-fixing ability makes it beneficial for soil enrichment in degraded areas. Additionally, it is a subject of interest in botanical and conservation studies due to its distribution and habitat preferences.