Não consta resumo na publicação.

Chamaecrista nictans subsp.patellaria var. ramosa Irwin & Barneby (Cassia Patellaria Dc), popularly know as "peninha", "mata-pasto", "falsa-sensitiva" e "falsa-dormideira", is Brazilian plant of the family Leguminosae. It is considered a garden and plantation weed, but in folk medicine is used for kidney problems and renal calculi. In order to identify their plant as a drug the morfology, histology, phytochemical screening, caracterization of fluid extract and plant powder were studied. In phytochemical screening the presence of flavonoid, saponins, steroids, tanins and coumarins was detected. A pharmacological assay was also carried out to test effect of chronic treatment with fluid extract in the experimental urolithiases in rats, through the development of calculi by surgical insertion of a foreign body their bladder. In rats, the results showed that chronic treatment with the same dosage of that used in folk medicine had no influence on the stones formed.