Allium cepa variant aggregatum, aka Potato onion. Forms a cluster of irregular shape of underground bulbs. Some bulbs may be 2 to 3" in diameter, but most are small. Thick skin, color - orangish yellow.
Rare to produce seeds, propagated by the small bulbs. A strong bulb will form smaller bulbs, each with a leafy top. A weak bulb will usually produce a single large bulb. Space 4 - 6" to allow for clumps. Planted September - March in FL.
Harvest as bulbs are large enough for eating. Mature green onions can be used fresh like any type of bunch onion. Cook mature bulbs after removing the outer skin.
Information from U of FL.