Allium cepa var. aggregatum is a scientific name of

Allium cepa var. aggregatum is a scientific name for Multiple onions.
Multiplier onion type of onion plant producing small clustered mild-flavored bulbs used as multiple having or involving more than one part or entity.
The onion plant has a fan of hollow, bluish-green leaves and its bulb at the base of the plant begins to swell when a certain day-length is reached. The bulbs are composed of shortened, compressed, underground stems surrounded by fleshy modified scale (leaves) that envelop a central bud at the tip of the stem.