Rare plants include a sedge, wooly lip-fern, Parker's pipewort, slender knotweed, spongy arrowhead, saltmarsh bulrush and pigmyweed.    From Wordnik.com.  [Hudson River National Estuarine Research Reserve, New York] Reference

Rare plants that occur or that have occurred here include heart leaf plantain, estuary beggar ticks, golden club, ovate spikerush, Parker's pipewort, Nuttall's micranthemum, Eaton's burmarigold, false pimpernel, winged monkey flower and swamp lousewort.    From Wordnik.com.  [Hudson River National Estuarine Research Reserve, New York] Reference

I have found, in considerable quantities, curious balls, composed apparently of fine grass or roots, of pipewort perhaps, from half an inch to four inches in diameter, and perfectly spherical.    From Wordnik.com.  [Walden] Reference

There also I have found, in considerable quantities, curious balls, composed apparently of fine grass or roots, of pipewort perhaps, from half an inch to four inches in diameter, and perfectly spherical.    From Wordnik.com.  [Walden~ Chapter 09 (historical)] Reference

Common pipewort.    From Wordnik.com.  [The Field Guide to Wildlife Habitats of the Eastern United States] Reference