1	"Scapes triangular in cross-section; umbels lax, 1-sided, 3–15-flowered"	"Allium triquetrum"
1	"Scapes terete; umbels compact or loose, not 1-sided, 20–500-flowered"	2
2	"Umbels compact, 200–500-flowered; bulbs globose; leaf blades semi-circular, hollow"	"Allium cepa"
2	"Umbels loose, 20–50-flowered; bulbs narrowly cylindrical or conical; leaf blades flat with a keel ridge above, solid"	"Allium tuberosum"