Galium boreale (Northern Bedstraw)
Whorls of leaves under delicate white flowers. Plants are edible and quite palatable. Typically hairless, some other ecotypes have a minimal amount of down.
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Photo 1 By: By Meneerke bloem (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons
Photo2 By: Midwest Groundcovers