Bittersweet, a name given to two woody vines. The climbing bittersweet, native to North America, is a low vine with tapering leaves. The colorful fruit is yellow with a scarlet husk. The small flowers are greenish. Bittersweet is often gathered for winter bouquets. The nightshade bittersweet is a vine related to the potato. It has purplish flowers with green spots. The poisonous berry is scarlet, about one-half inch (13 mm) in diameter. The plant is found wild in many parts of North America and Europe.

The climbing bittersweet is Celastrus scandens of the family Celastraceae; the nightshade bittersweet, Solanum dulcamara of the family Solanaceae.