Source: Magness et al. 1971
Additional vetch species are crown to a limited extent in the United States.
Monantha vetch, V. articulata Hornem. can be grown under the same conditions as common vetch. Plants are smooth or nearly so. The light lavender colored flowers are borne singly. It is distinguisbable mainly by flat seeds.
Bard vetch, V. monantha Retz. is much restricted in adaptation. It is grown only in irrigated areas of southern Califomia and Arizona. It is very similar to monantha vetch in appearance, but seeds are oval to round.
Narrowleaf vetch, V. augustifolia L., is adapted to soil and climatic conditions like those of common vetch. It is early maturing, ripening seed from spring plants in the north and is characterized by the narrow leaflets. It is suitable for pasturage throughout the Cotton Belt. It may be a troublesome weed in spring wheat.
Horse bean, V. faba L., is grown as a feed crop in the United States only in coastal valleys in California, and now much less than formerly. The upright-growing, near glabrous plants have large leaves with broad, oval leaflets. Weevils infesting the seeds are responsible for reduced usage of horse bean as a feed crop.
Woolypod vetch, V. dasycarpa Ten., is quite similar to hairy or smooth vetch, V. villosa, but is slightly less winter hardy and grows at slightly lower winter temperatures. It is a valuable winter vetch for the Cotton Belt.