The plant comes from the dried mature seeds of the legume cassia or small cassia. Herb properties for the dried seeds, rhombic square, like a horseshoe, slightly pointed at one end, truncated at one end, 5 to 8 mm long, 2.5 to 3 mm wide. Surface yellow-brown or green-brown, smooth and lustrous, both sides of each side of a raised brown ribs, ribs on each side of a light-colored and slightly depressed lines, water immersion from here to swell and crack. Hard and unbreakable cross-sectional skin thin, visible grayish white to yellowish endosperm, cotyledons yellow or dark brown, strongly folded and crinkled. Gas is absent, taste slightly bitter, slightly mucilaginous. The particles are uniform, full and yellowish brown is preferred.