Brassicaceae, formerly known as Cruciferae, is named for its Cross-like (Cruciferous) flower. Unique in the plant world for having 4 petals, Rapeseed does not follow Fibonacci sequence.
The fruit of Rapeseed is refined to make Canola oil. With 30-40% high sugar content it makes and excellent source of food for pollinators. Rapeseed is self-fertile, and has shown in testing that pollination with its own pollen results in seeds 19% heavier than pollination from another Rapeseed. Brassicas are unique for containing more agricultural crops than any other family, consisting of Cabbage, Radish, Mustard, Horseradish, Turnips, Kohlrabi, Brussel Sprouts, Broccoli, & Cauliflower. Rapeseed lends itself to teaching the formidable "Triangle of U" concept. One petal is removable for detailed study of the sepal and stamen. A ripe pod, magnified 3x life-size is depicted in cross section, removable from base.