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Drosera gigantea
''Drosera gigantea'', the giant sundew, is an erect perennial tuberous species in the carnivorous plant genus ''Drosera'' that is endemic to Western Australia. It grows in sandy soils at the margins of swamps and near granite outcrops along the Western Australian coast from Albany north to just south of Geraldton. ''D. gigantea'' produces small shield-shaped leaves along many lateral branches that look like a small tree. Individual plants can grow up to tall.〔 Because of its tall, tree-like form, it is considered one of the largest ''Drosera'' species. It is also easily cultivated and enjoys damp, humid conditions often provided in greenhouses.〔D'Amato, Peter. 1998. ''The Savage Garden: Cultivating Carnivorous Plants''. Ten Speed Press: Berkeley, California. pp. 157.〕 White flowers emerge from August to November.〔 The red tubers of this species can grow to be in diameter and may be a metre below ground.〔〔Rice, Barry. 2009. (The tuberous erect & scrambling ''Drosera'' ). The Carnivorous Plant FAQ. Accessed online: 12 August 2009.〕
''D. gigantea'' was first described and named by John Lindley in his 1839 ''A sketch of the vegetation of the Swan River Colony''. In 1992, N. G. Marchant and Allen Lowrie described a new subspecies, ''D. gigantea'' subsp. ''geniculata'', that grows to tall in black sandy soils near Perth and to its south. Jan Schlauer disagreed with Marchant and Lowrie's decision to give the new taxon a rank of subspecies and thus published a new combination of the taxon at the rank of variety in a 1996 issue of the ''Carnivorous Plant Newsletter''. He argued that subspecies should be reserved for those occasions where allopatric, or geographically isolated, speciation occurred and varieties are best used in cases where sympatric speciation is suspected.〔Schlauer, J. 1996. (A dichotomous key to the genus ''Drosera'' L. (Droseraceae) ). ''Carnivorous Plant Newsletter'', 25(3): 67-88.〕 Others disagree with this assessment, as Western Australia's online flora database, FloraBase, lists the varietal taxon (''D. gigantea'' var. ''geniculata'' (N.G.Marchant & Lowrie) Schlauer) as a synonym of the subspecies.
The shoots of ''D. gigantea'' have been found to contain the rare secondary metabolites naphthoquinone, glucosides, droserone, hydroxydroserone, and plumbagin. It is thought that the glucosides are responsible for the brown colour of the plant.
== See also ==
*List of ''Drosera'' species
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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