swain·so·na \swānˈsōnə\noun Etymology: New Latin, from Isaac Swainson died 1806 English gardener 1.capitalized: a genus of Australian herbs and subshrubs (family Leguminosae) having odd-pinnate leaves and racemes of small variously colored flowers with orbicular standard and twisted wings 2.-s: any plant of the genus Swainsona — see darling pea