Sophora japonica has white flowers and is native to the United States. It grew at 23 ~ 46 N and 86 ~ 65438 E+024 ...17th century and was introduced to Europe and Africa. China/KLOC-Qingdao was introduced from Europe at the end of October/August, and the flowers are edible.
Now, because two kinds of Sophora japonica are very common, if you want to refer to a certain kind of Sophora japonica, you'd better explain whether it is Sophora japonica or Sophora japonica, so as to avoid misunderstanding.
Although the traditional Sophora japonica must be Sophora japonica, because Sophora japonica did not exist before.