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The two species, Allium insubricum and narcissiflorum, are nearly identical, the major difference being that while the umbels are pendant or nodding in both species, they remain pendant in A. insubricum, but become erect when going to seed in A. narcissiflorum. There are other minor differences cited, but the nodding vs. erect characteristic seems the easiest to watch for.
Hi Stephen, here is an very old pic (slide) from A. narcissiflorum, wild in France, with more flowers than A. insubricum.
Hey Mark...glad to have you with us!