This work stablishes pharmacognostic parameters to Jacaranda decurrens Cham. roots, Bignoniaceae, known in the folk medicine as carobinha. Morphological and histological characteristics, phytochemical tests, ash and reducing sugars contents are descripted. The results showed steroids/triterpenes, sugars reducers, starch, mucilage and saponinas presence; the tenor of total ashes was of 2,21%, and insoluble in acid of 0,63%; the humidity of 6,42% and the tenor of sugars reducers was of 2,77%.