Grain is free, rugose, and the pericarp is hyaline and loose.
The pericarp or pod contains about twenty-four prismatic-shaped nuts.
It is official in all Pharmacopœias and the pericarp is the part employed.
The pericarp is membranaceous, and adheres to the seed, forming a kind of caryopsides.
The parts of the pericarp of the nut are united so as to appear one.