Seedling. Key characteristics: hypocotyl has hairs; often, the underside of the leaves will have maroon-colored markings; leaves are alternate.
Vegetative plant. Key characteristics: leaf margins range from entire to having coarse teeth; stems are often maroon-black in color; leaves often have "shot-hole" appearance from flea beetle feeding activity. Leaf hair varies depending upon species.
Flower. Key characteristics: white, star-shaped, and occur in clusters.
Fruit. Key characteristics: occur in clusters, round, change from green to black at maturity. Green fruit is toxic.
Seed of Solanum ptycanthum are rounded, rough-textured and have a diameter of approximately 1.5 mm.
Life cycle: summer annual.