None of these native species are cultivated although they contribute to grazing and may be an important part of wild hay crops. They contribute nitrogen and thus promote the growth of associated grass. The clovers may be annual or perennial. Leaves are mostly trifoliate, rarely 5 to 7 leaflets.
Flower heads are usually short spikes or umbels with numerous small individual flowers in the head.
James A. Duke. Food and feed Crops of the United States.