Brassica napus
Also: colza, oil-seed rape.
A pale green European plant of the cabbage family (Brassicaceae), grown for feeding livestock and for its oil, as well as being a pot herb.
The plant has lobed leaves from 10 to 35cm in length, and 3 to 20cm wide, covered in scattered hairs. The stems have small, light yellow flowers, and can grow up to a metre in length. The edible parts of the plant are much like spinach. The seeds are round and 1 to 3mm in diameter.
lordaych says you might mention in "rape" that canola oil is actually rapeseed oil from canada, that has been bred to reduce its erucic acid content (a highly toxic amino acid).