It is official in all Pharmacopoeias and the pericarp is the part employed.
"The Medicinal Plants of the Philippines"
T. H. Pardo de Tavera
This bush is ten or twelve feet in height, and its seeds grow in a burr-like pericarp.
"Popular Adventure Tales"
Mayne Reid
The macaws flapped their wings, the monkeys ran outward and then stopped, and a simultaneous cry from the voices of both birds and beasts echoed on all sides; and then there was a general chattering and screaming, as though the fall of the great pericarp had given pleasure to all parties.
"Popular Adventure Tales"
Mayne Reid