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Capsella bursa-pastoris
''Capsella bursa-pastoris'', known by its common name shepherd's-purse because of its triangular, purse-like pods, is a small (up to 0.5 m) annual and ruderal species, and a member of the Brassicaceae or mustard family. It is native to eastern Europe and Asia minor but is naturalized and considered a common weed in many parts of the world, especially in colder climates,〔(【引用サイトリンク】 work = Flora of Pakistan )〕 including Great Britain, where it is regarded as an archaeophyte,〔Preston CD, Pearman DA & Dines TD (2002) New Atlas of the British Flora. Oxford University Press〕 North America〔(USDA PLANTS Profile: Capsella bursa-pastoris (L.) Medik )〕 and China〔(【引用サイトリンク】 work = Flora of China )〕 but also in the Mediterranean and North Africa.〔 ''Capsella bursa-pastoris'' is closely related to the model organism ''Arabidopsis thaliana'' and is also used as a model organism due to the variety of genes expressed throughout its life cycle that can be compared to genes that are well studied in ''A. thaliana''. Unlike most flowering plants, it flowers almost all year round.〔〔 Like many other annual ruderals exploiting disturbed ground, ''C. bursa-pastoris'' reproduces entirely from seed, has a long soil seed bank,〔 and short generation time〔 and is capable of producing several generations each year.
== Description ==
''C. bursa-pastoris'' plants grow from a rosette of lobed leaves at the base. From the base emerges a stem about 0.2 to 0.5 m tall, which bears a few pointed leaves which partly grasp the stem. The flowers are white and small, in loose racemes, and produce seed pods which are heart-shaped.〔
Like a number of other plants in several plant families, its seeds contain a substance known as mucilage, a condition known as myxospermy. The adaptive value of myxospermy is unknown,〔 although the fact that mucilage becomes sticky when wet has led some to propose that ''C. bursa-pastoris'' traps insects which then provide nutrients to the seedling, which would make it protocarnivorous.
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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