Kuroda: scientific name of Solanum nigrum, alias: longan grass, black star, wild eggplant (northeast), black girl (Hebei), black sky naked (Jiangsu), wild pepper, eggplant, bulb grass (Zhejiang), wild pepper tree (Jiangxi), seven buttons, black grass (Fujian), ground bubble and ground. The lower part of the stem is erect or slightly drooping, the base is often lignified, the upper part is multi-branched, the edge is slightly longitudinal, and it is sparsely hairy along the edge. Leaves alternate, petiole 0.5 ~ 2.5 cm long; Leaf blade is ovoid, 2.5 ~13cm long and1.5 ~ 7cm wide, with sharp apex, wedge-shaped or tapering to stalk at the base, asymmetrical wavy teeth at the leaf margin or the whole margin, sparse short hairs on both sides and dense veins below. Umbrella cymes are born outside axils, with 4 ~10 flowers; The flower diameter is about1cm; Pedicel 0.5 ~ 1 cm long, drooping; Calyx 5-lobed, lobes ovate-triangular, apex acute; Corolla radial, white, 5-parted, lobes ovate to elliptic, apex pointed; 5 stamens, inserted at the mouth of corolla, filaments about 65438 0 mm long, anthers yellow, about 2 mm long, close to each other and around pistil, with holes at the top; Pistil 1, about 5 mm long, ovary superior, ovoid, 2-loculed, densely villous below the middle. Berries are spherical, 4 ~ 6 mm in diameter, and purple-black when ripe. The flowering period is from June to 65438+10, and the fruiting period is from July to165438+10. Usually born on hillside forest margins, stream bushes and village gardens. Distributed in most provinces of China.