Clerodendrum trichotomum Identity & Plant Part
The botanical entity is Clerodendrum trichotomum Thunb., the harlequin glory bower, a large shrub of the Lamiaceae with fragrant white flowers, red star-shaped calyces and bright blue berries. The part used is the leaf. Stems, flowers and berries are not part of this ingredient.
The leaf has an unpleasant, rank smell when crushed, which gives it the Chinese trade name chou wu tong. Many other Clerodendrum species are used in different regions and are not interchangeable with it. The leaf carries phenylethanoid glycosides such as acteoside, together with diterpenes, flavonoids and alkaloids, named only as constituent families.
The shrub is common in gardens across East Asia, so the species is easy to confirm botanically by its opposite leaves, flower clusters and bright blue berries.












