5: Yellow water cress. Young. Alternate feather compound leaves. Some red clover leaves in lower left. (Prospect Park, May 22, 2011)

6: Yellow water cress. More mature with flowers starting. (Prospect Park, May 22, 2011)

7: Yellow water cress. Flower closeup. (Prospect Park, May 22, 2011)

1: Yellow watercress (Central Park, Jun 10, 2000)

3: Yellow watercress closeup. (Prospect Park, Jul 1, 2006)

4: Yellow watercress patch. (Prospect Park, Jul 1, 2006)

2: Yellow watercress (Prospect Park, Sep 2, 2000)