Thunberg, C.P. (1781), Nova Genera Plantarum 1: 19-21, t. 1 [tax. nov.]

• Type: "Japonice: Joro Utsugi vel Jamma Utsugi. Kaempf. Am. exotic. fasc. V. p. 854."

Thunberg, C.P. (August 1784), Flora Japonica: 185, t. 24 [secondary reference]

• Type: "Japonice: Joro, vulgo Utsugi vel Jamma Utsugi. Kaempf. Am. exot. Fasc. V. p. 854."

Don, G. (October 1832), A General History of Dichlamydeous Plants 2: 808 [secondary reference]

• Type: "Native of Japan."

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