Leucaena (scientific name: Mentha spicata?L.), also known as green mint, fragrant mint, Dutch mint, green mint, scented cauliflower, fish parsley. It is an erect perennial herb of the Labiatae family with erect stems and purple or white flowers that bloom from July to September.

Perennial herb. Stems erect, 40-130 cm tall, glabrous or nearly so, green, obtusely quadrangular, sulcate and striate, sterile branches only adnate to ground.

Leaves sessile or subsessile, ovate-oblong or oblong-lanceolate, 3-7 cm long, 1-2 cm wide, apex acute, base broadly cuneate to subrounded, margin acutely and irregularly serrate, herbaceous, green above, grayish-green below, lateral veins 6-7 pairs, with the midvein more or less concave above conspicuously raised and whitish below.

Verticillasters are borne on the tops of stems and branches in interrupted but upwardly crowded cylindrical spikes 4-10 centimeters long; bracteoles linear, longer than the calyx, 5-8 millimeters long, glabrous; pedicels 2 millimeters long, glabrous. Calyx campanulate, coherent teeth 2 mm long at flowering, outside glabrous, glandular punctate, inside glabrous, 5-veined, inconspicuous, calyx teeth 5, triangular-lanceolate, 1 mm long.

Corolla lavender, 4 mm long, glabrous on both surfaces, corolla tube 2 mm long, limb with 4 lobes, lobes subequal, upper lobe retuse. Stamens 4, projecting, subequal, filaments filiform, glabrous, anthers ovoid, 2-celled. Styles much projecting from corolla, apex equally 2-lobed, lobes subulate. Disk flat-topped. Ovary brown, glabrous. Ovary brown, glabrous.