Dames Rocket is an attractive but invasive flower at NBNC that blooms along the trail near the community garden as well as other spots near the river. Although the blossoms are pretty, be wary about planting it in your home garden because it can easily spread and become out-of-control!
White Clover is one of the few common plants that you can find on a mowed lawn. It is not native, but doesn't seem invasive at NBNC. It can be found on the lawn as well as at the edges of the mowed paths through the field.
And rounding out the week is another non-native/invasive plants: Birdsfoot Trefoil. You can find this species growing in fields, along roadsides, and in other open locations.