Poo Run was a floristically significant seepage wetland located southeast of Petersburg on a headwater two miles from the Appomattox River.  It contained the largest and most vigorous populations of the yellow pitcher plant, Sarracenia flava L., in Virginia.  There were 28 wetland species listed by the Virginia Department of Conservation and Recreation as rare to uncommon or extremely rare at this site, many at their northern limit.  Historical sources indicate the area was known by colonial botanists and that at least one type specimen, Cleistes divaricata (L.) Ames, came from this wetland.  Burning of this region by native Americans and European settlers is shown to have been important in maintaining Poo Run in an early successional state.  Effects of the battle of Petersburg and the steam train also favored this wetland in the 1930's.  A cultural shift away from steam trains and to fire prevention led to encroachment by woody vegetation during the 1940's and 1950's.  The site was finally destroyed by scraping and filling during the construction of I-95.