Many thanks to Mark Mayfield, of the Kansas State University Herbarium, for identifying the plants at the left, as they appeared on the edge of Jerry's Pond (NE corner of Bird Runner) one autumn day.  The upper plant is in the mustard family, a member of the genus Rorippa, known as a Yellowcress.   The lower one is an aquatic Veronica, perhaps Veronica anagallis-aquatica.

What intrigued me was how the two species companioned each other, all along the pond edge, as shown below. 

Mark's service to the community is outstanding, as he helps us amateurs get to know the natural world!   Thank you, Mark!