The Key lime -LRB- Citrus aurantifolia -RRB- is a citrus species with a globose fruit , 2.5-5 cm in diameter -LRB- NUMBER@1 in -RRB- , that is yellow when ripe but usually picked green commercially .

The Key lime is a citrus fruit . Its fruit is 2.5-5 cm in diameter -LRB- NUMBER@1 in -RRB- . The fruit is yellow when ripe but usually it is picked green .
