Nakai, T. (1949), Classes, ordinae, familiae, subfamiilieae, tribus, genera nova quae attinent ad plantas Koreanas. Journal of Japanese Botany 24: 13 [tax. nov.]

• Type: Paulownia Siebold & Zucc.

The Angiosperm Phylogeny Group (2003), An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG II. Botanical Journal of the Linnean Society 141(4): 420 [secondary reference]

Thorne, R.F. & Reveal, J.L. (2007), An Updated Classification of the Class Magnoliopsida ("Angiospermae"). Botanical Review 73(2): 139 [secondary reference]

Council of Heads of Australasian Herbaria (2008), Australian Plant Census: - APC [secondary reference]

• APC Dist.: Qld (doubtfully naturalised)

Mabberley, D.J. (1 May 2008), Mabberley's Plant-Book Edn. 3: 938 [secondary reference]

The Angiosperm Phylogeny Group (2009), An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III. Botanical Journal of the Linnean Society 161(2): 117 [secondary reference]

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