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''Crassula tetragona'' is a succulent plant native to Southern Africa. It is widely distributed from the Orange River boundary of Namaqualand to beyond the Kei River in the Eastern Cape. "Tetragona" comes from the phyllotaxy of the leaves. It is popularly named the "miniature pine tree" among ornamental plant enthusiasts, for its popular use as a "pine tree" in Bonsai. == Habit and general description == The plant is erect or spreads shrubless to 1 m (3 ft). It has woody stems with brown bark, with crossed pairs of leaves. Leaves are green to dark green in color. The plant features terminal inflorescence ending in white flowers that come up in summer. The chromosome number varies: 2n=16, 32, 48. The species was first described by Linnaeus in 1753 in his book ''Species Plantarum''〔Linnaeus, C.F. 1753 ''Species Plantarum''.〕 There are six recognized subspecies, originally named by Tolken, as follows: *''C. tetragona'' subsp. ''acutifolia'' *''C. tetragona'' subsp. ''tetragona'' *''C. tetragona'' subsp. ''rudis'' *''C. tetragona'' subsp. ''connivens'' *''C. tetragona'' subsp. ''lignescens'' *''C. tetragona'' subsp. ''robusta'' The subspecies are separated geographically, generally with only one subspecies per geographic area. These plants are usually used as an ornamental, although they are believed to have been used as a medicinal plant by Thunberg, who wrote: "''Crassula tetragona'', somewhat of an stringent nature, boiled in milk, in the quantity of a handful, is used as a remedy for diarrhoea."〔''Crassula'', a grower's guide, Gordon Rowley, 2003. ISBN 88-900511-1-6〕 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「Crassula tetragona」の詳細全文を読む スポンサード リンク
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