The genus Allium has had quite a taxonomic journey and is at this time (stay tuned!) in the amaryllis family, Amaryllidaceae, where it had once been, so welcome back Allium. There are over 400 species of Allium native to the Northern Hemisphere. Arizona has 13 of those and nodding onion, Allium cernuum is one of them. Yay! Oh, And I know, I know, it’s unlikely that an onion will usurp the rose as the national plant of the United States. Allow me to dream. The photos are mine.