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.
Leaves crowded, lyrate-pinnatifid or pinnate, glandular-toothed. Flowers in erect elongated racemes, petals and sepals equal. Tetilla, an allied genus, has very unequal petals and sepals. There are three or four species or varieties of similar habit and appearance.
1. F. sonchifolia. - This species grows about 2 or 3 feet high, unbranched, with purple flowers appearing in Summer.