Edible bulbs that are pungent in aroma and flavor. They grow in multiple layers within the bulb.
Unknown, but they may have evolved in southwestern Asia.
Romans spread the onion throughout Europe.
Onions can be yellow, brown, white, red, or purple. They also vary in shape (globe, spindle, and flat).
New Oxford Book of Food Plants by John Vaughan et al. (2009)
“Onion” from Encyclopedia Britannica https://www.britannica.com/plant/onion-plant
“Origin and History of Onions” by Dr. Indu Mehta (2017)