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Brassica rapa
''Brassica rapa'' L. is a plant consisting of various widely cultivated subspecies including the turnip (a root vegetable); the mizuna, napa cabbage, and cime di rapa (leaf vegetables); and the annual turnip rape (''Brassica rapa'' subsp. ''oleifera'', an oilseed which has many common names, including field mustard, bird rape, keblock, and colza).
The oilseed is sometimes also called ''canola'',〔 which is one reason why it is sometimes confused with rapeseed oil, but this comes from a different ''Brassica'' species (''Brassica napus''). The oilseeds known as canola are sometimes particular varieties of ''Brassica rapa'' (termed Polish Canola) but usually the related species ''Brassica napus'' (rapeseed) and ''Brassica juncea'' (mustard greens).
In the 18th century the turnip and the oilseed-producing variants were seen as being different species by Carl Linnaeus who named them ''B. rapa'' and ''B. campestris''. 20th-century taxonomists found that the plants were cross fertile and thus belonged to the same species. Since the turnip had been named first by Linnaeus, the name ''Brassica rapa'' was adopted.
Many butterflies, including small white pollinate the ''B. rapa'' flowers.
== References ==
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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