Morelle is a plant with poisonous green or black fruit commonly called black nightshade. Some synonyms for Morelle include deadly nightshade, garden nightshade, belladonna, and Solanum nigrum. These synonyms are often used interchangeably to describe the same plant. Morelle is native to both Eurasia and Africa but has spread to other parts of the world over time. It is part of the nightshade family and can grow up to three feet tall. While the plant is poisonous if ingested, it has been used in herbal medicine to treat various ailments, including asthma, fever, and rheumatism.