On 10/6/2016 at 1:15 PM, blue_dolphin said:...scallions, "are either harvested very young from the regular bulb-forming onions we are familiar with, or they can come from other varieties that actually never form bulbs,"
There are also cultivars—used as scallions—that are sort of in between. They form an enlarged base, but not as much as a common globe onion.