Cassia fistola alia est cebula alia innda: i.e. there is a species of cassia fistola called cebula, and another species called innda. The best way to procure it is from reeds, and indeed from those which are the most fleshy, the best looking, and the smoothest.
Nature: it is medium between hot and cold, and it is wet. It purges inflammatory humor (i.e. burnt red bile) from the stomach primarily, and phlegm secondarily. It lubricates and evacuates the abdomen without harm or hurt, so that it is suitable for pregnant women. It clears the liver, and for that reason according to Avicenna it is suitable for those having jaundice, headache, tertian fever, and for the severe diseases, and for every disease caused by choler. It purges the remote parts.
Dosage: the minimum dose of it is one half ounce, and the maximum dose up to two ounces.