Here are some photos of a rare midwestern Allium from Iowa, Kansas, Nebraska, South Dakota, Oklahoma, and Texas, but far from common within that large area. It is mostly restricted to Dakota sandstone formations which greatly decreases the suitable habitat area, but fortunately it can also be found in another loess type soil in western Kansas that is sticky wet 'gumbo clay' in the spring and powdery water resistant dirt in the summer.
The photos are cultivated plants growing in sandy red clay of eastern Tennessee and seem quite happy. They are blooming here in TN at the same time that I saw them in bloom in the wild in central Kansas in April 2006 and 2007. The fragrance is intense and can be smelled before the plant is seen, reminiscent of Dianthus superbus.
Aaron Floden
Knoxville, TN