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Or S. elaeagnifolium?
Yellow fruits on ground...field had been cut
Around 1-1.5 feet tall.
Solanaceae -- thanks to Stig Madsen for ID help. He thought the thorns might be too thin, which is why I've put it in ID Please, but I've been thru all the NJ Solanum sp., & this is the only one even close. Growing in an abandoned railyard -- perfect match on habitat. Fruits are 1–2 cm across.
Solanum carolinense, Carolina horsenettle is not a true nettle, but a member of the Solanaceae, or nightshade family. It is a perennial herbaceous plant, native to the southeastern United States that has spread widely throughout North America. This plant has hard spines along the stems that can penetrate the skin and break off, causing much pain.