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While black nightshade is a common name for a few species in the Solanum genus, in this article, I am specifically referring to the edible Solanum species that go by that common name. These species include Solanum nigrum, S. ptychanthum, and S. americanuum.
The study showed that moderate amounts of black nightshade (30-60g) rarely resulted in any side effects. I assume they gave the ripe berries to the mice, but which part of the plant was administered is unclear, as they also explain the slight toxicity found in the leaves.
Black nightshade is a somewhat bushy, spreading annual. Its growth habit depends on where it’s growing; in compact soil such as a dirt driveway, it spreads close to the ground.
The first is belladonna (Atropa belladonna), which goes by the common name deadly nightshade but can also go by the name black nightshade. The other toxic nightshade plant that grows in the same habitat as black nightshade is bittersweet nightshade (Solanum dulcamara).