We have a citrus tree I cannot identify at our new home. The fruit is small, nothing larger than a golf ball, most smaller. I can't really identify the taste/smell as being specifically a lemon or a lime. I can determine it is not sweet enough for an orange or tangerine. I am leaning towards a Key Lime but did not think they would live this far north (midway between Jacksonville and St. Augustine) and this tree is obviously mature.
Minds are like parachutes; they work better when they are open.