A friend who's really into "native" plants told me these are good specimens of "star flowers." Seen on Mount Erie, on the ground as I was heading to the western look-out point. According to this website -- https://plantcaretoday.com/star-flower-plant.html -- star flowers prefer "dappled sunlight" or "shade," and not full sun.
Thanks to lyenochka for letting me know they can be invasive.
And thanks to Bonnie Seach for suggesting word changes!

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