in botany, a genus of the gynandria diandria clas. The generic character is taken from the nectarium, which is tubular, situated at the bottom of the corolla; and the inferior labium of it is fixed to the filyus. There are four species of the arethusa, all natives of America, except the capensis, which is only found at the Cape of Good Hope.

ARGEMONE, in botany, a genus of the polyandria monogynia clas. The corolla consists of six petals; the calyx of three leaves; and the capsule is semi-valved. There are three species of argemone, none of which are natives of Britain. They are all a kind of poppies.