Upright annual or biennial that grows 1.5 – 7 feet tall. Has serrated leaflet edges with three leaflets per leaf. Has white or yellow flowers and as extensive taproot. The white-flowered sweetclover (M. alba) is talker, coarser-stemmed, and has coarser leaves than the yellow-flowered type (M. officinalis). Yellow sweetclover is more drought tolerant, more vigorous as a seedling, flowers earlier, and has spreading growth.
David Clay, Kurtis Reitsma, and Sharon Clay (editors)- South Dakota State University