When I was picking this afternoon, I spotted teeny tiny critters on a seedhead. Aphids! Very interesting......
UPDATE JANUARY 20, 2022 So my biologist friend Sam Kieschnick happened to see this post and sent me some thoughts....
"Gosh," he wrote, "I hate to tell you this, but you just collected the males! The females are the ones that produce the seeds. Here's what those look like. The males have the flag-like flowers. If you don't see any buffalograss germinating in that spot, it's because those were all boys. The female flowers are close to the ground."
As always, thanks, Sam!