| Family | Rutaceae |
| Scientific name | Citrus × limon |
| Common name (English) | Lemon |
| Common name (Malay) | Limau |
| Identified as | Introduced plant on Project M.A.R.S.’s land |
Citrus × limon, commonly known as lemon, is a small evergreen tree or shrub in the Rutaceae family. Believed to be a hybrid between bitter orange (Citrus × aurantium) and citron (Citrus medica), it is cultivated worldwide for its fragrant, acidic fruits, which are used in culinary, beverage, and preservative applications. Traditionally, various parts of the plant—including fruit, leaves, and peel—have been used in folk medicine for their antioxidant, digestive, antimicrobial, and immune-supporting properties. With its culinary, medicinal, and economic significance, Citrus × limon remains one of the most widely recognized and utilized citrus species globally.