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The Tennis Ball Banksia (''Banksia laevigata'' subsp. ''laevigata'') is a subspecies of small woody shrub in the plant genus ''Banksia''. It occurs in Western Australia's semi-arid shrubland. It and the closely related ''B. laevigata'' subsp. ''fuscolutea (Golden Ball Banksia) are the two subspecies of the species ''Banksia laevigata''. ==Taxonomy== The species ''B. laevigata'' was first described by Swiss botanist Carl Meissner in 1856, after being originally collected by James Drummond in 1848. No separate subspecies were recognised until Alex George collected specimens of subspecies ''fuscolutea'' east of Hyden in 1964, and formally named it two years later. The naming of a new subspecies automatically created the autonym (botany) subspecies ''laevigata''. The common name is derived from the resemblance of its inflorescences to tennis balls. George described its nearest probable relative as ''Banksia audax'' and placed it in the series Cyrtostylis, which he concedes is rather heterogeneous. The series was split into three in the 1996 morphological cladistic analysis by botanists Kevin Thiele and Pauline Ladiges, with ''B. laevigata'' placed in the new series Ochraceae with ''B. audax'' and ''B. benthamiana'' in their arrangement. This was reinforced in American botanist Austin Mast’s 2002 analysis, as ''B. laevigata'' came out as sister to three groups; the first the pair comprising ''B. audax'' and ''B. benthamiana''. Early in 2007, Mast and Thiele rearranged the genus ''Banksia'' by merging ''Dryandra'' into it, and published ''B.'' subg. ''Spathulatae'' for the taxa having spoon-shaped cotyledons; thus ''B.'' subg. ''Banksia'' was redefined as encompassing taxa lacking spoon-shaped cotyledons. They foreshadowed publishing a full arrangement once DNA sampling of ''Dryandra'' was complete; in the meantime, if Mast and Thiele's nomenclatural changes are taken as an interim arrangement, then ''B. laevigata'' subsp. ''laevigata'' is placed in ''B.'' subg. ''Banksia''. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Banksia laevigata subsp. laevigata」の詳細全文を読む スポンサード リンク
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