Raphanus sativus.

A variety of the Common Radish, particularly adapted for the production of oil, and distinguished by the name R. sativus olifer, or Oil Radish. Its stems are dwarf, from a foot and a half to two feet in height, much branched, spreading, and produce more seed-pods than the Common Radish. It is grown rather extensively in China for its oil; from whence it has been introduced into and cultivated in some parts of Europe: but it does not appear with any particular success, though much has been said and written in its favor.

It seems best suited for southern latitudes, where it may be sown in September, and harvested the following May or June: but, in the northern portions of the United States, it will be found too tender to withstand the winter; and the seed will therefore require to be sown in spring.

The oil is obtained from the seed, and is considered superior to rape-seed oil, but is extracted with greater difficulty.

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