Our friend Karen Williams at the USDA writes:
The story of the Pawnee maize is fascinating! You have probably seen the display cases in Beltsville of the collection of maize varieties. Years ago, David and I were involved in getting all the samples photographed. Attached are photos of the 3 samples identified as Pawnee varieties. You are welcome to post these to your blog, if you think they are of interest.
Unfortunately, the display cases are so old (1930s or earlier) that no documentation on their history exists. We don’t even know who collected them. They predate the NPGS so there are no corresponding germplasm samples.
So lets really push our luck here, and ask whether anyone out there has any information about the USDA’s display case collections?