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.
Herbs, not climbing, or erect or climbing shrubs, rarely trees. Leaves pinnate. Flowers solitary, racemose, or paniculate. Stamens 10, usually diadelphous. Pods 2-valved, rarely small and indehiscent or inflated.