Many of the plants are annuals; among these are some of the commonest weeds of cultivation, shepherd's purse (Capsella Bursa-pastoris), charlock (Brassica Sinapis), and such common FIG.
Irio is London rocket, so-called because it sprang up after the fire of 1666), Brassica (cabbage and mustard), Diplotaxis (rocket), Cochlearia (scurvy-grass), Capsella (shepherd's purse), Lepidium (cress), Thlaspi (penny-cress), Cakile (sea rocket), Raphanus (radish), and others.
- Several forms of plants included in the genus Brassica are cultivated for the oil which is present in their ripe seeds.
The one most extensively grown for this purpose is known as colza, rape or coleseed, in Germany as Raps (Brassica napus, var.
The wild form Brassica campestris, the wild coleseed, colza or kohlsaat, of the fields of England and many parts of Europe, is sometimes cultivated on the European continent for its seed, which, however, is inferior in value to rape as an oil-yielding product.
In addition to the previously mentioned rape, a variety of another species (or subspecies) of Brassica, namely, Brassica rapa, var.
'RAPE OIL, an important fatty oil, known also as "sweet oil," either expressed or extracted from the crushed seeds of cultivated varieties of the cruciferous genus Brassica, the parent form of the whole apparently being the wild navew, B.