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Buckinghamia : ウィキペディア英語版
Buckinghamia

''Buckinghamia'' is a genus of only two known species of trees, belonging to the plant family Proteaceae.〔〔〔〔 They grow naturally only (endemic) in the rainforests of the wet tropics region of north eastern Queensland, Australia.〔〔〔 The ivory curl flower, ''B. celsissima'', is the well known, popular and widely cultivated species in gardens and parks, in eastern and southern mainland Australia, and additionally as street trees north from about Brisbane.〔〔 The second species, ''B. ferruginiflora'', was only recently described in 1988.
==History, classification and evolution==

The genus was named in 1868 by Ferdinand von Mueller in honour of Richard Grenville, the Duke of Buckingham,〔 who was Secretary of State for the Colonies from 1866 to 1868.〔 It was initially placed in a tribe Grevilleae, but the feature of having four ovules per carpel led C. Venkata Rao to classify it in the tribe Telopeae, and within this a new subtribe Hollandaeae based on the antero-posterior orientation of the perianth, with the genera ''Hollandaea'', ''Cardwellia'', ''Knightia'', ''Opisthiolepis'' and ''Stenocarpus''.〔
Lawrie Johnson and Barbara G. Briggs recognised the affinities of this genus with the rainforest taxon ''Opisthiolepis'' and classified the two in the subtribe Buckinghamiinae within the tribe Embothrieae in the subfamily Grevilleoideae in their 1975 monograph "On the Proteaceae: the evolution and classification of a southern family", and thus related to ''Lomatia'', ''Stenocarpus'' and the Embothriinae.〔 However, analysis of chloroplast sequences revealed a much closer relationship of ''Buckinghamia'' and ''Opisthiolepis'' with ''Grevillea'' instead. Both genera have eleven pairs of chromosomes, which is reduced further in ''Grevillea''.〔 More recent evolutionary botanical science confirms that they correlate closest with the genera ''Opisthiolepis'', ''Finschia'', ''Grevillea'' and ''Hakea'' in the subtribe Hakeinae, with ''Buckinghamia'' and ''Opisthiolepis'' as two early offshoots from the ancestors of the other three genera.〔〔〔

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