WordNet sense 1 (European strong-scented perennial herb with grey-green bitter-tasting leaves; an irritant similar to poison ivy):

herb of grace, Ruta graveolens

WordNet sense 2 (sadness associated with some wrong done or some disappointment):

regret, ruefulness, sorrow

WordNet sense 3 (feel remorse for; feel sorry for; be contrite about):

repent, repent