Black Nightshade,  Solanum ptycanthum (S. nigrum)
Solanaceae or Nightshade Family

Low plant, 1 to 2 feet tall.  Flowers white, drooping, five-petaled, in small clusters. Leaves egg-shaped, usually with wavy edges, not opposite each other.  Fruit a black berry.

Exotic weed of waste places.  In Wildwood, occasional along the bikeway, but easily overlooked.

Bittersweet nightshade (S. dulcamara) has similar flowers, except purple.  The fruit is red, and the leaves are three-lobed. Horse nettle (S. carolinense) has similar white flowers, but larger, the leaves are lobed or toothed, and the fruit yellow.