The ponderosa lemon (Citrus x pyriformis), also called Skierniewice lemon, is a citrus hybrid of a pomelo and a citron. It is not the same as the 'Yuma Ponderosa' lemon-pomelo hybrid used as citrus rootstock. Ponderosa lemon trees are slow growing but reach a height of 12 to 24 feet (3.7 to 7.3 m) at maturity. The leaves are long, evergreen, glossy, and citron-like, being ovate elliptic in shape and lemon scented. They have medium-thick branches with many spines. New growth is purple-tinged, as are the flowers. Ponderosa lemon also has larger than average citrus flowers, and bears fruit throughout the year. When grown as an ornamental, it requires pruning to control the shape, and may be trained as a bush or tree.