Johar (Senna siamea (Lam.) H.S. Irwin & Barneby) is one of species in Leguminosae family. Pharmacognosic studies are a step in determining the identity and quality value of medicinal plants. A study in pharmacognosy is the observation of microscopic characters. The purpose of this study was to analyze the anatomical structure and histochemistry of the leaves and branches of the Johar plant as…