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Oh thanks so much for looking and commenting @dajohns1420. I really appreciate it!
Here's what one of its mates looks like (also Apollo 13, germinated at the same time.)

What do you think of this one? I thought it was a pollen sac, too.

that isn;t a pre-flower. just a 'spur'.
the pre-flower will appear behind the spur.

or now that I stare at it...
might be a tiny female...