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.
There are scarcely any species of this tribe grown for decorative purposes, though some of the Clovers are highly ornamental. The best are Trifolium rubens, dark red; T. elegans, pink; T. ochroleucum, yellowish white; and T. incarnatum, an annual, bright scarlet. The genus Medicago is remark-able for the great diversity in the form of the pods in different species. It is spirally twisted, resembling a shell, and variously sculptured or furnished with spines, or quite plain.