Objectives : A morphological classification among Rheum palmatum Linne, Rheum undulatum Linne and Rumex crispus was made through microscopic observation. Methods : The slice of the tested material made by paraffin section technique was colored with Safranine Malachite Green contrast methods, and then observed and photographed by olymphus-BHT. Results: 1. Stellate spots were found on the intersection of Rheum palmatum, composed of heteromorphy vascular bundles. 2. Stellate sponts were not found in Rheum undulatum and Rumex crispus, because they do not have heteromorphy vascular bundles. Conclusion : Rheum palmatum can be distinguished with Rheum undulatum and Rumex crispus, based on the presence of Stellate spots on its intersection.