Several occurrences of the federally-listed threatened plant, Knieskern's beaked-rush (Rhynchospora knieskernii), have also been documented within the Reserve boundaries, as well as the sensitive joint-vetch (Aeschynome), Seabeach Amaranth (Amaranthus pumulis), and American chaffseed (Schwalbea americana), all federally-listed as threatened plants.    From Wordnik.com.  [Jacques Cousteau National Estuarine Research Reserve, New Jersey] Reference