[1] He also widely studied the Japanese flora and fauna with Philipp Franz von Siebold, the author of Fauna Japonica and Flora Japonica.
[2] He wrote a translation of Flora Japonica titled Taisei honzou meiso (Japanese:"泰西本草名疏") that was published in 1829.
He died in 1901, and he was ennobled with the title of baron (danshaku).
In 1901, botanist William Botting Hemsley named a genus of flowering plants in the willow family, Salicaceae, from China and Vietnam, Itoa in his honour.
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