What grows low to the ground in NC that has fruit that looks like a lime?

In North Carolina, the plant that grows low to the ground and produces fruit resembling a lime is the key lime (Citrus aurantiifolia), particularly in warmer regions. However, more commonly, the fruit you might be referring to is that of the wild lime, or the small fruit of certain varieties of hardy citrus plants that can be found in gardens. Additionally, the plant known as the "sour orange" may also produce small, lime-like fruits in some areas of NC.