Eastern black nightshade – Solanum ptycanthum

Eastern black nightshade fruit

Eastern black nightshade fruit

Eastern black nightshade leaf

Eastern black nightshade leaf

Eastern black nightshade underside of leaf

Eastern black nightshade underside of leaf

Eastern black nightshade young plant

Eastern black nightshade young plant

Eastern black nightshade seedling

Eastern black nightshade seedling

Eastern black nightshade

Solanum ptycanthum Dun.
Solanaceae (Nightshade family)

Life cycle
Erect, branching summer annual.

Leaves
Seedlings have small, egg-shaped cotyledons with a pointed tip and a purplish tinge underneath followed by alternate, petiolated, simple leaves. First leaves are generally smooth, egg-shaped with wavy margins and a purplish tinge underneath; later leaves are slightly hairy, egg- to diamond-shaped with entire to irregularly toothed margins.

Stems
Erect and branching, up to 3-foot-tall stems with few hairs.

Flowers and fruit
Flowers are white to purple tinged, star-shaped with five petals fused at the base surrounding five bright yellow anthers; found in downward facing clusters. Berries are glossy black at maturity and globe-shaped, and contain up to 110 seeds.

Reproduction
Seeds.

Toxicity
All plant parts are toxic to animals.

Similar weeds
Bittersweet nightshade (S. dulcamara L.)
Differs by having a vining, perennial habit; leaves that are oval to egg-shaped with pointed tips, smooth margins and usually two basal lobes; and purple to blue flowers that yield bright red, oval berries at maturity.