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Sinapis (weeds) L.
This genus contains 4 species of herbaceous and cruciferous plants. White mustard, Sinapis alba, is grown for its seeds, sometimes also for its leaves. The seeds are one of the sources of mustard powder. However, the plant can also grow in cereals and others crops as a weed. Sinapis arvensis is a serious weed in various regions, affecting many crops, especially cereals.
The plants grow typically to a height of 30-80 cm and may have a branched stem. The lower leaves have a petiole which is much reduced in the upper leaves. The flowers are yellow with 4 petals and tend to spread horizontally. The fruits are elongated capsules (siliques) with a characteristic, seedless beak.
Currently, the following species have been entered into the system: