Potato, Solanum tuberosum, is an herbaceous perennial plant in the family Solanaceae which is grown for its edible tubers. The potato plant has a branched stem and alternately arranged leaves consisting of leaflets which are both of unequal size and shape. The leaflets can be oval to oblong in shape and the leaves can reach 10–30 cm (4–12 in) in length and 5–15 cm (2–6 in) wide. The potato plant produces white or blue flowers and yellow-green berries. The potato tubers grow underground and generally located in the top 25 cm (10 in) of the soil. The tubers can range in color from yellow to red or purple depending on the variety. Potato plants can reach in excess of 1 m (3.3 ft) in height and are grown as annual plants, surviving only one growing season. Potato may also be referred to as, spud, Irish potato, white potato or Spanish potato and originates from South America.