sprouts is not a leguminous plant because it do not belong to the family fabacea as all leguminous plants belongs to this family.
Sprouts belongs to the mustard family.
--BRASSICACEAE or CRUCIFERAE:MUSTARD FAMILY :
Broccoli, cabbage, cauliflower, kale, mustard, Pak choi, radish. Description Alternate, simple leaves with waxy cuticle or hairs. Crucifer: 4 petalled flower, 4 + 2 stamens, mostly biennial. Plants have characteristic sulfur odor. Cultural Characteristics Usually cool season crop. Can make do with very little water because of waxy cuticle. Shallow rooted. Does not do well in acid soil; add plenty of organic matter to mitigate soil pH. Cabbage moth larvae eat leaves & hearts, so tie it closed. Club root can be a problem if not rotated.