Lemons are oval citrus fruits with smooth porous skin. Some fruits have a pointed tip on the bottom of the fruit while other lemons, such as Florida lemons are rounded at the base. Ponderosa lemons are quite larger than other lemon varieties and resemble elongated grapefruits. Lemon fruits color range from greenish yellow to bright yellow. Lemons look very similar to limes, but lemons tend to be a little larger and are yellow (when ripe), where limes are green.