A leafy green salad green; a vegetable, that grows in numerous varieties.
Most likely the Middle East and Mediterranean region. Egyptians are credited with first cultivating lettuce.
Lettuce spread through Europe as empires rose and fell. First, the Egyptians cultivated it, then the Greeks, then the Romans who popularized it throughout their empire.
The crew of the International Space Station grew their own lettuce in outer space in 2015.
“From Ancient Egypt to Outer Space, the Delicious History of Lettuce” by Rebecca Rupp (2015)
“The History of Lettuce” by Nan Fisher (2018) https://www.motherearthgardener.com/plant-profiles/edible/the-history-of-lettuce-zm0z18szphe
New Oxford Book of Food Plants by John Vaughan et al. (2009)