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Placospermum : ウィキペディア英語版 | Placospermum
''Placospermum'' is a genus of a single species of large trees, constituting part of the plant family Proteaceae. The species ''Placospermum coriaceum'' grows only (endemic) in the rainforests of the wet tropics region of north eastern Queensland, Australia.〔 Common names include Rose Silky Oak and Plate-seeded Oak.〔 ==History== The genus and species were first formally scientifically described in 1924 by Cyril T. White and William D. Francis.〔 The precise relationships of the genus were unclear, though it was clear it was an early offshoot within the Proteaceae and retained primitive characteristics, until Lawrie Johnson and Barbara G. Briggs classified it in the subfamily Persoonioideae in their 1975 monograph "On the Proteaceae: the evolution and classification of a southern family". They noted that it had large chromosomes, like those of ''Persoonia'' and allied genera, as well as sharing some other primitive features.
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