Potato leaf, or PL, is one of two major types of leaves which tomato

Tomato

The word "tomato" may refer to the plant or the edible, typically red, fruit which it bears. Originating in South America, the tomato was spread around the world following the Spanish colonization of the Americas, and its many varieties are now widely grown, often in greenhouses in cooler...

 plants exhibit. The other type is referred to as "regular leaf," or RL. Simply stated, potato leaf tomato plants have a smooth leaf edge when compared with the serrated edge of the regular leaf. The shape is oval and may feature notches separating large lobes. Its color is dark green.
Examples of potato leaf tomatoes include the Brandywine

Brandywine (tomato)

thumb|left|240px|Brandywine plant, with potato leavesThe Brandywine tomato plant is an heirloom cultivar of the species, with large potato-leaved foliage and which bears large pink beefsteak-shaped fruit.-Description:...

, Prudens Purple, Brandy Boy, Lillian's Yellow Heirloom, Stupice and others. The potato leaf trait is recessive.