argemonia

μὴ κακὸν εὖ ἔρξῃς· σπείρειν ἴσον ἔστ' ἐνὶ πόντῳ → do no good to a bad man; it is like sowing in the sea

Latin > English (Lewis & Short)

argĕmōnĭa: ae, f.,
I a plant similar to the preceding, Plin. 25, 9, 56, § 102; Cels. 5, 27, 10.