growing along the side of a trail to the river. No. 860821007.
Flock numbered over 10,000 birds and was composed of only this one species as best as I could determine.
Blackened most of a 5 acre recently harvested corn field.
5 photos
growing in a moist area near the trail, basal leaves persistent, rosulate, cauline leaf petioles pubescent with some pubescence on stems. No. 870430025b.
See also: http://beta.floranorthamerica.org/Cardamine_hirsuta