I get curious about this every time I cut open a lime: how can these citrus fruits not have seeds? Or are they just so tiny I can't see them? Turns out, the limes typically sold in supermarkets  are Persian or Tahiti limes and are indeed seedless. Petite key limes, on the other hand, contain seeds. Seedless limes are classified as a parthenocarpic fruit , meaning the flowers don't require pollen to make fruit. Though some fruits are bred to have no seeds, seedless limes are naturally occurring, so squeeze away.