This section is from the book "Handbook Of Hardy Trees, Shrubs, And Herbaceous Plants", by W. Botting Hemsley. Also available from Amazon: Handbook of hardy trees, shrubs, and herbaceous plants.
Annual erect herbs with branching hairs and alternate dentate pinnate or pinnatifid leaves and purplish or white flowers. This may be known from all other Cruciferae by its pinnately lobed petals and bracteate racemes. About six species are reported, all from Chili. The name is from to cut, and a petal.
1. S. Walkeri. - A hardy annual about 2 feet high with small fragrant white flowers.